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