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