No missable achievements (plus 25 unknown)
Sign in with Steam or Xbox to track your progress, and:
Make your first kill.
When burning, set someone else on fire by running into them.
Perform 13 executions.
Reach the half way mark of The Original or Excess Postage campaign.
Kill four or more people with a single Rocket Launcher missile.
Blow up 50 barrels.
Finish a level with less than 10 health.
Complete The Original or Excess Postage campaign.
Watch the entire credit sequence.
Kill three or more people with a single Mine explosive.
Execute two of every hostile type.
Duck under 10 rockets.
Kill 30 people with the Napalm Launcher.
Complete The Original or Excess Postage campaign having left no survivors.
Earn a kill with every weapon.
Complete all Rampage levels.
Complete every level in Co-op mode.
Complete The Original or Excess Postage campaign having killed only hostiles.
Complete The Original campaign with a total play time of 30:00 or less.
Complete the Excess Postage campaign in Nightmare difficulty.
Perfect all Rampage levels.