Here is the full list of all 20 Crimson Dragon: Side Story achievements worth 200 gamerscore.
Release the White Reaver's latent power by awakening all skills.
Unlock all skills.
Defeat Dark Phantom 200 times.
You've cleared "Battle after battle after battle!" without taking any damage!
You've collected 50 Jewels using the in-game GPS feature.
You've cleared "The Ultimate Test"!
You've cleared "Planet Draco's Masters"!
You've unlocked 40 skills.
You've defeated 4000 enemies.
The White Reaver has awakened 5 skills.
You've finished off Glyrin and Hestrine with action skills!
You've defeated 1000 enemies.
You've unlocked 10 skills.
You've equipped yourself with a new skill.
You've cleared Story Mode.
You've defeated 100 enemies with subskills.
You've changed the dragon's color.
You've unlocked 1 skill.
You've cleared stage 1.
You've defeated 50 enemies.