Here is the full list of all 42 The Sandbox achievements.
Play more than 3 hours
Finish the "Ecology" Campaign
Play for 2 days in a row.
Create more than 10000 fire pixels across different game sessions
Pour more than 10000 units on screen
Pour more than 5000 units on screen
Create more than 4000 oil units.
Use 1000 multi units
Use 1000 bulb or bright units.
Use 800 Heater pixels.
Use 800 Cooler pixels.
Blow up more than 15000 gas units.
Pour more than 1000 units on screen
Put at least one pixel of each Element on screen at the same time
Release 4000 pixels of Virus or Antivirus
Spill oil in the sea.
Finish the "Initial Story" Campaign
Get 7 elements or more.
Get 15 elements or more.
Get 30 elements.
Play more than 5 hours
Play for 4 days in a row.
Play for 8 days in a row.
Play for 12 days in a row.
Plant more than 300 trees across different game sessions
Burn a forest of 15 trees
Finish the "User Made" Campaign
Finish the "Lonely Human" Campaign
Finish the "Music" Campaign
Finish the "Contraptions" Campaign
Finish the "Dinosaurs" Campaign
Finish the "Pixel Art" Campaign
Finish the "Lasers & Pipes" Campaign
Finish the "Zombie Attack" Campaign
Finish the "Robocalypse" Campaign
Finish the "Holy Space" Campaign
Finish the "Retro Gaming" Campaign
Finish the "User-Created 2" Campaign
Finish the "Shinobi" Campaign
Finish the "Mix Vol.1" Campaign
Finish the "Farm Life" Campaign
Finish the "Mix Vol.2" Campaign