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