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.
Try to touch the sky.
Equip the full space set.
Equip the full paint set.
Take a seat in the Junk Shop.
Make friends with everyone on the island.
Craft every item.
Climb to the tippy top of the antenna.
Break everything on the island.
Complete the story.
Completed Avery's Quest
Equip the full ninja set.
Acquire all bracelets, and gain enlightenment.
Completed Martin's Quest
Completed Jill's Quest
Ragdoll into something as fast as you can.
Undertake a new, bigger quest.