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