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