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 Gelasers
Complete the game
Beat Iketomi
Seal the bond between Pankapu and his friends.
Beat 20 G.U.N. Units
Beat 5 D.O.O.R. Systems
Beat 15 Errant Souls
Get to the top of Itopia
Discover Omnia’s geography
Beat Gangreyn
Find all the Mudjins in Peppu
Beat 15 Sah'laks
Beat 15 Kardigans
Find all the Forges in Peppu
Beat 10 Zoldates (Boot)
Beat 200 Jawlaths
Visit all the areas of the Starry Deeps
Beat 20 Deevas
Beat 15 Mapihas
Discover Chii’s origins
Beat 30 A.I.M. Turrets
Beat 8 Smoogus
Visit all the areas of Gehöd
Beat Tokatanka
Beat 8 Fu’gus
Visit all the areas of the Archipelago of the Winds
Beat 30 Sh’mups
Beat 20 Magmatos before they explode
Beat 30 Crystalyns
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
Beat 30 Logjams
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 20 Zoldates (Claw)
Beat Zoldabilly
Obtain a Nebula
Defeat Tyroot
Visit all the areas of Mudjin Mere
Beat 100 Upakis
Beat 20 Slaps
Visit all the areas of the Arboretum
Beat 20 Gelatos
Beat 150 Gelatyns
Visit all the areas of the Verdant Forest
Discover a Sadhil Seed
Find a Mudjin
Find a Ferem’s Tear