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.
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.
Swing with the Sticky Hand 5 times without touching the ground.
Equip the full space set.
Equip the full paint set.
Craft every item.
Make friends with everyone on the island.
Take a seat in the Junk Shop.
Break everything on the island.
Ragdoll into something as fast as you can.
Try to touch the sky.
Complete the story.
Completed Avery's Quest
Completed Martin's Quest
Acquire all bracelets, and gain enlightenment.
Completed Jill's Quest
Climb to the tippy top of the antenna.
Equip the full ninja set.
Undertake a new, bigger quest.