Here is the full list of all 34 Washed Up! achievements.
Score 5000 Points
Score 10000 Points
Score 25000 Points
Score 50000 Points
Score 50000 Points on Fast Speed
Score 50000 Points on Insane Speed
Create a 5x5 scoring square
Create an 8x8 scoring square
Create a 9x9 scoring square
Have 4 scoring squares in progress at once
Have 2 TNT scoring squares in progress at once
Create a 5x5 TNT scoring square
Clear the play area entirely
Trigger the storm
Crash the ship
Crash the ship 3 times in a single game
Rewind time twice for the same scoring square
Crash 50 ships
Expand a TNT scoring square before it explodes
Created 100 TNT scoring squares
Destroy 1000 squares with cannons
Collect a letter with a TNT block
Collect a letter with a cannon explosion
Create / expand a scoring square with 1 second left in Time Attack
Have a scoring square fill up with 1 second left in Time Attack
Make a scoring square out of blocks of a single colour
Discard a block
Clear major pollution by calling the storm
All beaches filled with items but no pollution
All beaches polluted
Survive 5 minutes of Time Attack on any difficulty
Survive 10 minutes of Time Attack on any difficulty
Survive 10 minutes of Time Attack on Fast or Insane
Create a 6x6 scoring square in Time Attack mode