Here is the full list of all 26 Zenodyne R achievements.
Unlock unlimited credits!
Unlock all the lore!
Beat the game using the fifth ship
Clear Final Stage Hard (Ending B!)
Defeat the Commander (Ending C!)
Beat the game using the cameo ship!
Clear Stage 5 Hard
Clear Stage 4 Hard
Clear Stage 3 Hard
Beat the game using the first ship
Beat the game using the fourth ship
Unlock the Fifth Ship
Unlock all the ships!
Beat the game using the third ship
Unlock the Fourth Ship
Clear the Final Stage (Ending A)
Beat the game using the second ship
Unlock the Third Ship
Clear Stage 5
Clear Stage 4
Clear Stage 3
Unlock the Second Ship
Clear Stage 2
Clear Stage 2 Hard
Clear Stage 1
Clear Stage 1 Hard