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