Here is the full list of all 30 Proxy Blade Zero achievements.
Finish the Observatory Deck in Normal mode.
Finish the Observatory Deck in Easy mode.
Beat 25 Soldiers.
Beat 25 Grenadiers.
Beat 25 Footmen.
Beat Karthas in Normal mode.
Beat Karthas in Easy mode.
Parry 50 attacks.
Finish the Engine Grid in Easy mode.
Finish the Engine Grid in Normal mode.
First Game Over.
Enter the Engine Grid in Normal mode first.
Return to Proxy Blade Zero.
Start the game in Easy mode.
Beat 50 enemies while in 75%+ Overdrive.
Beat 25 Knights.
Beat 25 Archers.
Beat 25 Hammers.
Finish the Engine Grid in Critical mode.
Beat Karthas in Critical mode.
Finish the Observatory Deck in Critical mode.
Finish the Cyber Dome in Easy mode.
Finish the Cyber Dome in Normal mode.
Finish the Cyber Dome in Critical mode.
Finish the Dome Core in Easy mode.
Finish the Dome Core in Normal mode.
Finish the Dome Core in Critical mode.
Beat Anima in Easy mode.
Beat Anima in Normal mode.
Finish Proxy Blade in Critical mode.