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