Didn't get achievements.

[YourCaptain]

I completed the game, but I did not get any of the achievements. I only got 'Welcome to Aperture', 'Long-Term Relaxation' and 'Testing the Waters'. These were achieved on the same day, but I finished the game on another.

I know I missed a few, the secret ones that is.

[VRCrossing]

Same here, turned on cheats because of save corruption (triggers showing, not being dislabled) to enter showtriggers_toggle, but turned them off. How can I re-enable them so I don't have to start over again?
EDIT: Also wrote the changelevel command, because showtriggers_toggle didn't work.

[Rease]

Is it possible to get acivements by map [mapname]? Some don't work. "You should not be here"

[Andrusha]

If you turned on cheats achievments was disable.

[FirelanderX]

I didn't use any cheats yet my achievements just stopped unlocking

Edit: Figured it out, loading a Quicksave from the main menu disables achievements. Make sure to select Continue Game instead.