No missable achievements (plus 15 unknown)
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Lose the game on the Command Deck.
Knock an enemy out into space.
Kill an enemy with a Lasershot.
Get a marine to Sergeant rank.
Have a full squad of Sergeants.
Lose the game on the Medical Deck.
Beat the game on Easy difficulty.
Lose the game on the Engineering Deck.
Lose the game on the Armory Deck.
Lose the game on the Bridge Deck.
Have a full squad with laser weapons.
Beat the game on Normal difficulty.
Lose the game on the Alien Deck.
Beat the game on Hard difficulty.
Beat the game on Brutal difficulty.