On level 27: Dances With Werewolves, kill 5 werewolves in a row using only silverware. (Using anything else resets the counter)
Complete level 4: Chainsaw Hedgemaze Mayhem, without passwords.
Complete level 8: Titanic Toddler, without passwords.
Complete level 12: Mars Needs Cheerleaders, without passwords.
Complete level 16: Ants, without passwords.
Complete level 20: Invasion Of The Snakeoids, without passwords.
Complete level 24: Warehouse Of Evil Dolls, without passwords.
Complete level 28: Mark Of The Vampire, without passwords.
Complete level 32: Giant Ant Farm, without passwords.
Complete level 36: Monster Phobia, without passwords.
Complete level 40: Pyramid Of Fear 2, without passwords.
Complete level 44: The Curse Of Dr. Tongue, without passwords.
Complete the final level (48): Curse Of The Monster, without passwords despite the version differences.
Get that 2% drop chance, find the bonus icon, and enter the level 1 bonus: Day of the Tentacle!
Bring some explosives to find the bonus icon on level 9 and enter the bonus: Mushroom Men.
Save all 10 Cheerleaders on level 12 to reach the Bonus: Cheerleaders Vs the Monsters.
Get past some webs and grab the icon for level 17's bonus: Someplace Very Warm. (Gained on level title)
Use that skeleton key you saved to open the door to the icon and reach the level 22 Bonus: The Son of Dr. Tongue.
Pick up the '?' icon and reach the Level 33 bonus: Curse of the Pharaohs.
Complete all 48 levels and 6 bonus levels without game over (the level 1 bonus: Day Of The Tentacle is optional)
Beat level 1 with 10 saved neighbors and without taking damage.
Lead the zombies to your neighbors and finish level 1 only saving the pool guy.
Beat the first 15 levels with only one neighbor saved per level. (Level 8 is ignored)
Loot all 14 items on level 3: Terror In Aisle Five.
Kill 7 Chainsaw Maniacs on level 4: Chainsaw Hedgemaze Mayhem.
Mow enough weeds on level 11: Weeds Gone Bad, to get the Weed-Eater Bonus
Get the Skeleton Key just laying around on an island in level 15: Dinner On Monster Island.
Beat level 16: Ants in 111 seconds or less.
Beat level 18: Squidmen of the Deep, without swimming.
Kill 13 Evil Dolls on level 24: Warehouse Of Evil Dolls.
Kill 10 Pod Plants and mow enough weeds to get the bonus on Level 26: Where The Red Fern Growls.
Kill the 2 vampires on level 28: Mark Of The Vampire.
Break 4 soda machines on level 35: Boardwalk Of Terrors.
Mow through some webs in the boss fight on level 36: Monster Phobia till your weed-eater breaks.
Destroy all 3 vampires on level 39: Destroy All Vampires.
Kill 3 of the unreachable pod plants on level 44: The Curse Of Dr. Tongue.
Kill a jelly blob by throwing an ice pop at it.
Bubble a martian with the martian bubble gun.
Have 10 American footballs get caught by American footballers in one level to get the Bonus for Pass Completion.
Defeat a martian ship to get the "Alien Invasion Repulsed" bonus.
Kill 10 or more ants in a level to get the "Extermination" bonus.
Kill 10 or more gillmen in a level to get the "Fish Fry" bonus.
Hold at least one of every weapon and item in your inventory at the same time. (There are 21 total)
Kill every basic monster at least once in one session. (game overs and passwords allowed)
Defeat Lucas Arts' 1993 Gerneral Manager and Director of Developement: Kelly Flock.