No missable achievements (plus 24 unknown)
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Get your first Critter into the Elevator.
Beat the Timebomb Hate Bot.
Get blood on every solid object in a level.
Reach 30 lifetime level restarts.
Beat the Buzzsaw Hate Bot.
Get 100 lifetime Critter kills.
Dunk your first Critter in oil, and have fun doing it!
Beat the Drill Hate Bot.
Get 40 fires going simultaneously.
Have every Critter (at least two) in the level die within a one second timespan.
Get 250 lifetime Critter kills.
Beat the Flamethrower Hate Bot.
Kill Critters by all available methods: falling, spikes, buzzsaws, explosions, fire, and electricity.
Beat the Zapper Hate Bot.
Get a perfect score on every level in Stage 1.
Save a Critter that has been char-broiled red.
Beat the game.
Get 500 lifetime Critter kills.
Beat Hang Time without the Critter leaving the screen.
Save all Critters in Gone With The Wind in 45 seconds.
Get a perfect score on Split Second.
Find two different ways to set off the Oil Drum in Despair Mail.
Save more than three Critters in Six Enter - Three Leave.
Get a perfect score on every level in the game.