Here is the full list of all 26 PlateUp! achievements.
Serve a pizza to a customer
Serve a customer with less than a second to spare
Activate Practice Mode during preparation time
Serve a salad to a customer
Complete a day with a mess on at least 10 tiles
Complete a day without any player leaving the tile they started on
Serve a steak to a customer
Serve a stir fry to a customer
Serve a pie to a customer
Serve a fish to a customer
Serve a hotdog to a customer
Serve a breakfast to a customer
Serve a burger to a customer
Complete a day when the restaurant has been on fire for more than 15 seconds
Complete a day with 10 appliances on fire at once
Set a customer on fire
Cook something on a Danger Hob with an activated Gas Safety Override
Wear Trainers while holding a Sharp Knife
Convey an item back to where it started
Create a franchise
Reach Overtime Day 5
Reach Overtime Day 10
Reach Overtime Day 15
Throw away a cooked fish in the tutorial
Complete a day without anyone serving a customer directly
Have the first group to arrive still be waiting to order when the day ends