Here is the full list of all 12 Rez HD achievements worth 200 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
100% shot down/support item or played 10+ hrs in play mode areas1-5! Secret character unlocked!
Ranked 1st in lost area! Trance mission unlocked!
Ranked 1st in boss rush! Overdrive infinity (unlimited overdrives) unlocked!
Direct assault (trance) cleared! Immortal unlocked!
95% shot down rate achieved in play mode areas1-5! Boss rush unlocked!
Play mode area3 cleared! Area4 unlocked!
Play mode area4 cleared! Achieve 100% analyzation in areas1-4 to unlock area5!
Area5 cleared! Beyond mode unlocked!
Play mode area2 cleared! Area3 unlocked!
Play mode area1 cleared! Area2 unlocked!
Clear score attack over 30 times
Get a local ranking of 1st in all 5 areas in score attack