There are a maximum of 33 ProtoGalaxy achievements worth 903
51 tracked gamers have this game, 4 have completed it (7.84%)
Complete the Substructure mission without destroying any enemies (single player, normal difficulty or harder).
Unlocked by 6 tracked gamers (12% - TSA Ratio = 2.91)
Do you have a question about this achievement? Please post it in the ProtoGalaxy Forum