Throughout the show, Isabella and the Fireside Girls are earning patches, sometimes known as Fireside Patches ("Fireside Girl Jamboree"). Usually they are conveniently linked to whatever Phineas and Ferb are doing for the day, while others are just mentioned. Though the patches are usually just glanced over, the girls in Isabella's troop are all extremely enthusiastic about earning patches, and their sashes are usually shown full of patches.
It should also be noted that even if a troop member has already earned a patch, they can still get more by doing the same task again. In "Isabella and the Temple of Sap", regarding the 'Help Thy Neighbor Patch', Ginger had 52 of them and Milly has 53 (because she "went back that one afternoon").
Earned by becoming lifeguards at Phineas and Ferb's beach party. Even though it was not seen, the title of the patch could possibly mean that they were practicing Aquatic Safety, or that they went to the beach and none of them were injured and all swam safely. This badge was earned by the whole troop.
Earned by Isabella after successfully learning how to milk a cow. She stated that it was one of her easiest patches, saying that all you had to do was 'squeeze and pull' over and over. Since Isabella was the only Fireside Girl present, most likely she was the only girl to earn this patch.
Earned by Isabella after getting her tonsils removed. In real life, there are many Girl Scout patches they relate to just going through a brave act or tough obstacle (there is a patch for braving a house fire, for example), which is most likely where this patch's idea came from. Since Isabella is the only known Fireside Girl to have her tonsils removed, and is shown earning it, she is the only girl so far known to have gotten it.
Earned while she and her troop were at Camp Phineas and Ferb. As the names imply, the Tent Pitching Patch is earned if the whole troop is able to put up their tents successfully, and the Marshmallow Patch is earned when the girls roast marshmallows and the camp director (in this case Phineas) approves of them. Since all the girls were at Camp Phineas and Ferb, everyone in the troop earned both these patches.
Earned by helping the boys build the Paper Pelican. The girls also flew in the plane and helped with catering, which is probably parts to the patch as well. All the girls earned this since all were present at the time of building and all flew in the plane.
Earned by helping Phineas and Ferb produce their game show. Isabella was taught how to fix and work the camera and helped get the game show in order. Isabella is most likely the only one who earned this patch, though we see Gretchen applying makeup and Holly and Ginger were working the cameras.
Earned by repairing shrimp nets at the harbor, but this is never seen in the episode. Isabella mentions this to Phineas while he is on the boat at the harbor, and is with her whole troop, so all the girls earned it.
Saying A Word No One Else In The Room Knows Patch, Help Thy Neighbor Patch, Sap Collecting Patch, Team Leader Patch, and I Just Saw A Cute Boy Patch
Gretchen earns the first patch by saying the word 'Sesquipedalian' in front of the other girls. Since no one else knew what it meant, she earned the patch. The Help Thy Neighbour patch is usually used as an excuse for Isabella to help Phineas with his projects, though the other girls say that they have earned the patch 50 or more times. The Sap Collecting patch was earned when Holly and Katie got the sap out of a tree. Although the 2 aforementioned girls actually got the sap, Isabella said they all earned it. The I Just Saw a Cute Boy patch is earned for just that, seeing a cute boy. However, it can be taken away if no one else agrees. This happens to Ginger a couple of times throughout the episode, where she puts on the patch whenever she sees or thinks about Baljeet. Isabella also appears to have one visible at the top of her sash during the Fireside Girl song. This is most likely refering to Phineas. The Team Leader Patch can be seen on Isabella's sash: a patch version of the Fireside Girls emblem (only worn by present and past troop leaders).
Isabella has stated that she has already earned this patch, but it is unknown if the other girls have or not. Despite the fact that Isabella is a very avid cosmetologist for earning this patch, Phineas and Ferb do not enlist her help when they give Candace a make-over.
Honesty Patch, Enthusiasm Patch, Senior Service Patch, Totem Pole Carving Patch, Ice Cream Juggling Patch, Mountain Climbing Patch, Running With The Bulls Patch, Running With The Bullies Patch, Discovering Something That Doesn't Exist Patch, Wrestling An Alligator In A Sewer Patch, Bug Collecting Patch, Motion Sickness Patch, Cupcake Delivery Patch, All Time Record Patch and finally 37 unknown patches
All of these patches and more were earned by Candace in order to join the Fireside Girls.
Isabella kept asking Phineas to get an exclusive interview, but Phineas kept rejecting her because he and Ferb were too busy with their super hero double life. Candace later sarcastically tells Isabella she earned her "Uhh Durr" Patch when she realizes that Phineas is The Beak. This was confirmed as a real patch in Bee Story (though spelled "A-Der!"), as Isabella was wearing the patch on her sash.
Zookeeping Patch, Cooking Patch, Astronomy Patch, High Wire Patch
The first three patches are mentioned by Melissa at the start as patches she plans on earning. Isabella mentions the last one as she, Candace and Melissa are in the high wire section of the maze and have earned it twice.
Desert Tracking Patch, Rain-forest/Jungle Navigation Patch, Rock-climbing Patch, Non-power Flight Patch, Swift Water Rescue Patch, Concussion First-aid Patch
Their first four was that Phineas and Ferb created a bio-dome to make any environment in order to help them earn their patches, while the last two were when Adyson was washed away by a river after a rock fell onto her head.
Grub Eating Patch, Water-Finding Patch, Identifying Fauna and Flora Patch
Isabella found a bunch of grubs and, seeing how gross they were, wondered how she would get this patch. Later, she found out there were grubs in the s'mores she ate and that she was able to get it now. It is not shown whether Isabella gets the Water-Finding Patch or Identifying Fauna and Flora Patch, but since she made remarks saying that they would be easy to earn, it is assumed that she did achieve them.
All the girls earned their Beekeeping Patches, as it was first mentioned by Isabella in "Bee Day"; it was stated in "Bee Story" that Milly, Katie and Gretchen earned the Exploration Patch, Ginger and Holly had earned the Advanced Knot Tying Patch, and Isabella and Adyson both earned the Appliance Repair Patch.
In the show at Disney California Adventure, the DJ introduces the Fireside Girl Dancers as they try to earn their choreography patch, and later for the closing photo op, announces that they also need to earn a photography patch as well.
Sometimes, Isabella or another Fireside Girl will be making a sarcastic remark, and it is unknown whether the patch she is talking about is real or not. Others are very over the top in terms of ridiculousness, and it is unknown if they were just joking.
Earned for passing through the giant bubble the boys made. Though the girls were excited about earning this, it is one of the patches that is seemingly too odd to actually be considered a real patch, though it is still up for debate.
Another up-for-debate patch, this could have just been said to rile the girls up. It's unlikely that the Fireside organization would have a patch that would put the girls in danger. On the other hand, some confirmed Fireside Girl patches do put the girls in danger (such as the "Wrestling An Alligator In A Sewer" Patch).
This is most likely a sarcastic remark by Isabella to Candace, because for the whole episode Candace refused to listen to Isabella. She said it in a mocking tone, so it was probably meant to be sarcastic.
Though Isabella first mentions this patch as if it were real, when asked about it later, Isabella dryly said she was only joking and that is was impossible to actually ride a seahorse. (Buford may have proved her wrong moments later. However, he had grouped many seahorses together.)