This achievement is for accessing all 9 containment units
Full Game Walkthrough - All Achievements:
Containment Unit #2 (Frontier): 14:05
Containment Unit #1 (Military): 16:55
Containment Unit #8 (Armored): 1:23:05
Containment Unit #9 (Bunker): 1:27:40
Containment Unit #3 (Uranium): 1:42:55
Containment Unit #4 (Garden): 1:46:35
Containment Unit #5 (Reef Base): 1:49:40
Containment Unit #6 (Science HQ): 1:52:30
Containment Unit #7 (Nuclear): 1:55:55