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