Here is the full list of all 56 Pankapu achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Beat 20 Zoldates (Claw)
Leave Peppu
Defeat the Royal Gelato
Visit all the areas of Crystal Forest
Beat 10 Zoldates (Shield)
Visit all the areas of The Flowery Meadow
Beat 20 Gelafloras
Beat 100 Explosyns
Obtain a new Aegis
Visit all the areas of Beneath the Roots
Beat 1 Zoldalbino without exploiting their weak point
Meet Vaya in Stonefall Henge
Find Stonefall Henge
Beat 100 Upakis
Beat Zoldabilly
Obtain a Nebula
Defeat Tyroot
Beat 20 Slaps
Visit all the areas of Mudjin Mere
Visit all the areas of the Arboretum
Visit all the areas of the Verdant Forest
Discover a Sadhil Seed
Beat 20 Gelatos
Beat 150 Gelatyns
Find a Mudjin
Find a Ferem’s Tear
Beat 30 Logjams
Find all the Forges in Peppu
Find all the Mudjins in Peppu
Beat 20 Magmatos before they explode
Beat 30 Crystalyns
Beat 20 Gelasers
Beat 200 Jawlaths
Beat 15 Kardigans
Beat 20 Deevas
Beat 10 Zoldates (Boot)
Beat 30 Sh’mups
Beat 8 Fu’gus
Beat 8 Smoogus
Beat Tokatanka
Beat 15 Sah'laks
Beat 15 Mapihas
Beat 15 Errant Souls
Beat 20 G.U.N. Units
Beat 5 D.O.O.R. Systems
Beat 30 A.I.M. Turrets
Beat Gangreyn
Discover Chii’s origins
Seal the bond between Pankapu and his friends.
Visit all the areas of the Archipelago of the Winds
Visit all the areas of Gehöd
Visit all the areas of the Starry Deeps
Get to the top of Itopia
Discover Omnia’s geography
Complete the game
Beat Iketomi