Here is the full list of all 19 Zombies Ate My Neighbors and Ghoul Patrol achievements.
Access a bonus level in Zombies.
Let all neighbors die in a level.
Reach 10000 score.
Finish a level.
Save the max neighbors in one level.
Sucessfully enter a password.
Find all the weapon types in Zombies.
Find all the weapon types in Ghoul.
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 50000 score.
Reach 250000 score.
Save all the neighbors in Zombies.