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