Here is the full list of all 25 Poi achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Rescue all the baby Pin Birds.
Collect all the Explorer Medallions in Sinking Sands.
Collect all the Explorer Medallions in Mount Magma.
Hey, watch where you're rolling!
Collect 10 Explorer Medallions.
Do a triple jump.
Collect all the Explorer Medallions in Cozy Canyon.
Sometimes, things don't always go as planned.
Find a hidden hat.
Discover the mysterious travelling merchant.
Purchase an item from the shop.
Kick a Bucket Head.
Earn your first Explorer Medallion.
Find ALL the Fossils.
Collect all the Explorer Medallions in Crystal Cavern.
Find the legendary treasure.
Beat the game in New Game+ mode.
Collect ALL the Explorer Medallions.
Find all of the hidden costumes.
Visit the hidden planet.
Meet the requirements to open the Mysterious Gate.
Discover ALL the Locations.
Find ALL the Golden Gears.
Take a picture of ALL the creatures.
Take a picture of the Master Explorer.