Get all other trophies in the game
Cook the hamster in Maniac Mansion (Don't try this at home, kids!)
Play the whole game without skipping a cutscene
Sit through the end credits
Defeat Purple Tentacle yesterday
Reach yesterday without turning the stereo off
Acquire a diamond
Get Fred to sign the contract
Power Hoagie's Chron-o-John
Hoagie uses battery with Chron-o-John instead of plug
Red makes a super battery with only a little help from Hoagie
Pick up 45 things that don't belong to you
Talk to Washington, Jefferson, or Hancock while they're outside
Flush 50 objects through time
Ask the IRS agents if they're related
Power Laverne's Chron-o-John
Vacuum up a hamster
Win the human contest
Disqualify Harold
Laverne tries the chattering teeth on her human during the human show
Get a tiny sweater
Get all six novelty items
Wake up Dr. Fred
Try to alter the contract with Booboo-B-Gone
Try to sign the contract yourself with the quill pen
Enter the human contest
Talk to Dead Cousin Ted with all three kids
Make vinegar
Laverne thinks about eating the cat
Try to microwave the hamster again after he's thawed out
Microwave the frozen hamster
Make a skunk
Try to flush the hamster
Try to mix the red paint and the Booboo-B-Gone
Clothe Laverne in the costume
Climb through the chimney with all three kids
Change the flag
Deflate Oozo
Pick up 30 things that don't belong to you
Destroy a cherry tree
Create a cherry tree
Try to wash the dirty car with the brush
Make it rain
Hoagie eats a Hoagie
Ring the front desk bell 100 times
Open the safe
Get a job
Try to swap the textbook with the stamp album
Try to put something metal in the microwave
Pick up 15 things that don't belong to you
Try to mix the decaf and caffeinated coffees
Squirt five different people with disappearing ink
Close a door
Try to mix the disappearing ink with Booboo-B-Gone
Return the stamp album to Weird Ed
Turn off the television
Play Maniac Mansion
Find Fred's basement workshop