Here is the full list of all 40 Atom Zombie Smasher achievements.
Unlock all the vignettes.
Accrue 10,000 sniper kills.
Accrue 10,000 infantry kills.
Accrue 10,000 artillery kills.
Accrue 10,000 landmine kills.
Accrue 10,000 dynamite kills.
Launch 500 Llama Bombs.
Accrue 500 gold medals.
Rescue 100,000 people.
Rescue 10,000 scientists.
Complete a mission with 3 players.
Rescue 40 or more people in one helicopter pickup.
Complete a 20,000 point campaign.
Get 100 landmine kills in a mission.
Complete a mission under 30 seconds.
Rescue 300 people in a mission.
Destroy 50 Zed in one landmine explosion.
Get 100 dynamite kills in a mission.
Destroy 50 Zed in one dynamite explosion.
Cleanse four Zed territories with one Llama Bomb.
Use snipers to destroy 100 Zed in a mission.
Get 100 infantry kills in a mission.
Purchase a Llama Bomb.
Complete a campaign with the Triplets modifier.
Complete a campaign with the Hardcore and Permadeath modifier.
Complete a campaign with the Alt. Spawning modifier.
Destroy 50 Zed in one artillery strike.
Rescue everyone in a mission.
Defeat Wave 7 in the KringleJammer mini-game.
Destroy a Mega Zed.
Complete the campaign.
Complete a level-4 outbreak mission.
Have a merc reach Level 5 veterancy.
Rescue 200 people in a mission.
Complete a level-3 outbreak mission.
Get 100 artillery kills in a mission.
Rescue at least 100 people in July.
Destroy all Zed in a mission.
Survive the night.
Rescue 100 people in a mission.