Here is the full list of all 22 Lil Gator Game achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Equip the full space set.
Equip the full paint set.
YOU WILL NEVER KNOW THE TRUTH.
Learn the monkey's TRUE name.
Instruct the monkey on the power of creativity.
Learn the monkey's real name.
Learn the monkey's name.
Take a seat in the Junk Shop.
Break everything on the island.
Make friends with everyone on the island.
Craft every item.
Complete the story.
Climb to the tippy top of the antenna.
Completed Martin's Quest
Try to touch the sky.
Acquire all bracelets, and gain enlightenment.
Completed Avery's Quest
Swing with the Sticky Hand 5 times without touching the ground.
Completed Jill's Quest
Equip the full ninja set.
Undertake a new, bigger quest.
Ragdoll into something as fast as you can.