Here is the full list of all 24 Rooster Teeth vs Zombiens achievements.
Survive 50 Zombien waves.
Kill 10 brutes in a single sesion.
Kill a Zombien with every weapon in the game.
Kill 50 grunts in a single session.
Survive 30 Zombien waves.
Kill 15 plague carriers in a single session.
Build 10 traps in a single session.
Reach first place in a Daily Challenge leaderboard.
Get the player character to level 10.
Survive 20 Zombien waves.
Craft 20 traps/defenses in a single session.
Build 10 defenses in a single session.
Survive 10 Zombien waves.
Kill multiple enemies with a single trap.
Craft your first defense/trap.
Rescue your first cast member.
Get the player character to level 20.
Kill 30 brains in a single session.
Kill 20 kamizombiens before they explode in a single session.
Kill 25 militia zombiens in a single session.
Recruit a full party.
Have 15+ of each resource at a given time.
Accumulate a 10x multiplier.
Purchase every weapon in the game.