Here is the full list of all 58 Day of the Tentacle Remastered achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Get all other achievements in the game
Reach yesterday without turning the stereo off
Hoagie uses battery with Chron-o-John instead of plug
Cook the hamster in Maniac Mansion (Don't try this at home, kids!)
Ring the front desk bell 100 times
Try to microwave the hamster again after he's thawed out
Talk to Washington, Jefferson, or Hancock while they're outside
Try to flush the hamster
Laverne thinks about eating the cat
Try to put something metal in the microwave
Laverne tries the chattering teeth on her human during the human show
Turn off the television
Try to wash the dirty car with the brush
Try to sign the contract yourself with the quill pen
Flush 50 objects through time
Sit through the end credits
Play the whole game without skipping a cutscene
Defeat Purple Tentacle yesterday
Acquire a diamond
Get Fred to sign the contract
Wake up Dr. Fred
Try to alter the contract with Booboo-B-Gone
Power Laverne's Chron-o-John
Vacuum up a hamster
Win the human contest
Pick up 45 things that don't belong to you
Deflate Oozo
Climb through the chimney with all three kids
Squirt five different people with disappearing ink
Return the stamp album to Weird Ed
Power Hoagie's Chron-o-John
Red makes a super battery with only a little help from Hoagie
Make vinegar
Get all six novelty items
Make a skunk
Try to mix the red paint and the Booboo-B-Gone
Disqualify Harold
Talk to Dead Cousin Ted with all three kids
Microwave the frozen hamster
Get a tiny sweater
Try to swap the textbook with the stamp album
Pick up 30 things that don't belong to you
Enter the human contest
Clothe Laverne in the costume
Change the flag
Try to mix the disappearing ink with Booboo-B-Gone
Make it rain
Ask the IRS agents if they're related
Get a job
Hoagie eats a Hoagie
Open the safe
Try to mix the decaf and caffeinated coffees
Pick up 15 things that don't belong to you
Play Maniac Mansion
Close a door
Destroy a cherry tree
Create a cherry tree
Find Fred's basement workshop