Here is the full list of all 16 Multibombers achievements.
Blow up 100 people.
Get your first kill.
You forgot that bombs do damage.
Win your first game.
Lose your first game.
Collect at least one of each powerup.
Blow somebody else up and kill yourself in the process.
Die 100 times.
Die for the first time.
Die 250 times.
Finish your first game.
Finish ten games.
Finish 100 games.
Be in a full lobby.
Finish the tutorial.
You've joined the official Discord.