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