Here is the full list of all 26 Save Room achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Complete level XXXIX
Complete level XXXVII
Complete level XXXV
Complete level XXXIII
Complete level XXXI
Complete level XXIX
Complete level XXVII
Complete level XXV
Complete level XXIII
Complete level XXI
Complete level XIX
Complete level XVII
Examined one of your weapons.
Tried to use a red or yellow herb.
Performed a herb combination.
Complete level XV
Complete level XIII
Complete level XI
Used a health item.
Tried to finish a level while wounded.
Complete level IX
Complete level VII
Tried to finish a level without reloading your guns.
Complete level V
Complete level III
Complete level I