Achievement requires opening all safes in Modern Warfare 2 Campaign. Three safes located in specific missions
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Nine locks require combinations, codes, and combinations to unlock. All safes contain weapon upgrades, though not all upgrades are safe-accessible. Players need to find clues or memorize codes for Master of Unlocking achievement
Codes can be imported into Gacha Club by going to Profile and clicking Import. Codes can be used to change character appearance including outfits and eyes
Twelve safes must be unlocked in total. Jeweler's Cellar safe requires 7-3-9 combination from Lygrove's Letter. Workshop safe contains Soul of the Automaton with 3-1-4 code. Madam Xiao-Xiao's Chamber safe uses 5-7-3 combination. Keep safe requires 3-1-9 and 0-1-8 combinations after reset
Safe codes unlock optional puzzles throughout the game. Most safes are located off the beaten path. Codes often require clues from environment or Artefacts