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