Here is the full list of all 19 Zombies Ate My Neighbors and Ghoul Patrol achievements.
Finish a level.
Sucessfully enter a password.
Save the max neighbors in one level.
Find all the weapon types in Zombies.
Find all the weapon types in Ghoul.
Access a bonus level in Zombies.
Access all bonus levels in Zombies.
Beat level 48 in Zombies.
Beat level 18 in Ghoul.
Defeat Boss: Demon Lord.
Defeat Boss: Ghost Pirate.
Defeat Boss: Robot.
Defeat Boss: Royal Revenant.
Defeat Boss: Samurai Ghost.
Reach 10000 score.
Reach 50000 score.
Reach 250000 score.
Let all neighbors die in a level.
Save all the neighbors in Zombies.