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