Here is the full list of all 58 Day of the Tentacle Remastered achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Get all other achievements in the game
Cook the hamster in Maniac Mansion (Don't try this at home, kids!)
Flush 50 objects through time
Laverne tries the chattering teeth on her human during the human show
Reach yesterday without turning the stereo off
Hoagie uses battery with Chron-o-John instead of plug
Try to sign the contract yourself with the quill pen
Try to alter the contract with Booboo-B-Gone
Talk to Washington, Jefferson, or Hancock while they're outside
Ring the front desk bell 100 times
Sit through the end credits
Play the whole game without skipping a cutscene
Defeat Purple Tentacle yesterday
Power Hoagie's Chron-o-John
Red makes a super battery with only a little help from Hoagie
Hoagie eats a Hoagie
Try to swap the textbook with the stamp album
Acquire a diamond
Get Fred to sign the contract
Power Laverne's Chron-o-John
Vacuum up a hamster
Get a tiny sweater
Pick up 45 things that don't belong to you
Laverne thinks about eating the cat
Win the human contest
Wake up Dr. Fred
Try to put something metal in the microwave
Try to mix the red paint and the Booboo-B-Gone
Disqualify Harold
Squirt five different people with disappearing ink
Enter the human contest
Try to microwave the hamster again after he's thawed out
Microwave the frozen hamster
Make vinegar
Make a skunk
Try to flush the hamster
Talk to Dead Cousin Ted with all three kids
Clothe Laverne in the costume
Deflate Oozo
Ask the IRS agents if they're related
Climb through the chimney with all three kids
Change the flag
Get a job
Try to mix the disappearing ink with Booboo-B-Gone
Try to wash the dirty car with the brush
Make it rain
Return the stamp album to Weird Ed
Get all six novelty items
Pick up 30 things that don't belong to you
Destroy a cherry tree
Create a cherry tree
Turn off the television
Open the safe
Pick up 15 things that don't belong to you
Try to mix the decaf and caffeinated coffees
Play Maniac Mansion
Find Fred's basement workshop
Close a door