No missable achievements (plus 21 unknown)
Sign in with Steam or Xbox to track your progress, and:
Kill 100 enemies.
Survive the first campaign level.
Kill 1000 enemies.
Survive the second campaign level.
Kill four enemies at once with an explosive.
Survive the third campaign level.
Survive the fourth campaign level.
Survive ten waves in a survival map.
Survive the fifth campaign level.
Finish a nighttime campaign level without turning on the flashlight.
Survive the sixth campaign level.
Survive the seventh campaign level.
Survive the eight campaign level.
Acquire all guns and upgrades in campaign mode.
Survive the ninth campaign level.
Survive the final campaign level.
Blow the head off of something large and toothy.
Acquire 200 throwables in campaign mode.
Acquire all guns and upgrades in a survival game.
Survive a nighttime campaign level using only the knife.
Decapitate each enemy type at least once.