Destroy the south-east generator.

Save boy human.

Visit every room.

Clear every room.

Hear all ghosts.

Hear every tune.

Achieve the normal ending.

Achieve the best ending.

Beat Rogue Sentry on Standard mode.

Beat Rogue Sentry on Golden Gun mode.

Beat Rogue Sentry on You Only Live Once mode.

Beat Rogue Sentry on Gravity mode.

Achieve all 40/40 in-game achievements.

Tracking module installed.

Install all weapon modules.

Beat Standard mode in under 20 minutes in-game play time.

Get all 40/40 in-game achievements in under 120 minutes in-game play time.

Abandon your post.