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