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