Here is the full list of all 20 Crimson Dragon: Side Story achievements worth 200 gamerscore.
Defeat the Glyrin!
Eliminate the Dark Phantom from the Crimson Dragon world.
Complete "Planet Draco's Masters".
Complete "The Ultimate Test".
Complete "Battle after battle after battle!" without taking any damage.
Defeat 50 enemies.
Defeat 100 enemies using only subskills.
Finish off Glyrin and Hestrine using action skills.
Defeat 1000 enemies.
Defeat 4000 enemies.
Unlock a skill.
Unlock 10 skills
Unlock 40 skills.
Unlock all skills.
Equip yourself with a new skill.
Use the in-game GPS feature to collect 50 Jewels.
Defeat Dark Phantom 200 times.
Power-up the White Reaver by awakening 5 skills.
Release the White Reaver's latent power by awakening all skills.
Customize the dragon's color.