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