Popular Guy - Befriend everyone in the connective pit.

Peeker - Win as seeker in hide & seek.

Close To Kaboom - Finish the gas leak minigame.

Snake Handler - Defeat Ramamba.

The Best Hider - Complete Garten of Banban 0.

Fashionable Jingles - Collect all keychains. (9 in total)

Nabnab - right after you walk outside the starting room










Captain Fiddles - in the chest that opens after completing the 4th ball puzzle










Syringeon - on the red door in the hub










Banbaleena - on the edge of a pink wall after climbing the ladders in the hub area










Banban - right next to the tunnel truffletoot runs into










Bittergiggle - while following banban and nabnab to the big door next to some traffic cones










Jumbo Josh - in the back right corner of the big room with the big door










Stinger Flynn - on a givanium barrel right before the gas leak puzzle room










Opila Bird - on a couch in the final room of the game










Reader - Read all notes. (6 in total)

Note 1 - On a table in the classroom igloo










Note 2 - On a table in the room where you collect the wheels










Note 3 - On the floor on the left side of the big room with the big door










Note 4 - On a table right before the gas leak puzzle room










Note 5 - On the floor in the gas leak puzzle room










Note 6 - On a table in the slow seline room

True Banbanner - Access every link in the main menu, including the poster.
On the main menu, click all 6 of the social links AND the Garten of Banban 8 wishlist button.

Electrician - Finish the gas leak minigame flawlessly.
This one can be a bit difficult to do right, and the game also doesn't do a great job of explaining the minigame itself. Doing it flawlessly requires that you don't mess up ever, meaning all of the 5 lights on the bottom of the panel should still be white once you finish.

To play the minigame correctly, you need to hit the up arrow on the panel once the two squiggly lines on the monitor are overlapping each other, AND you need to make sure the red wire is going to a monitor that does not have a red face on it, otherwise the game will end instantly.

Talking Escargot - Meet Slow Seline.
After finishing the gas leak minigame, follow all the characters until you get to this point shown below.










Take a detour down the dark hallway on the right and you will end up at a door with a keycard scanner above it. Open the door and take the hammer.










Once you make it back to the hub area and banban kills the giant snake thing, climb up the ladders and fall into this red hole on the wall










Inside will be a door, take the boards off with the hammer and open the door with the purple keycard (gotten from the chest that opens after doing the 4th ball puzzle) and inside will be slow seline










That Which Killed The Cat - You're curious.
At the very end of the game is a whiteboard with banban on it. Interacting with it will unlock the achievement.