Here is the full list of all 23 Terraform achievements.
Open the Level Editor
Start your 5th Terraform session
Complete the HexCorp part of Terraform!
Achieve a total Terraform rating of at least 1000
Use a total of 1000 tools
Play 1000 turns of Terraform
Complete the University part of Terraform!
Achieve a total Terraform rating of at least 500
Start your second Terraform session
Play 100 turns of Terraform
Use a total of 100 tools
Achieve a total Terraform rating of at least 100
Retry a level
Use a total of 10 tools
Play 10 turns of Terraform
Start your first Terraform session
Share one planet made with the planet editor
Share five planets made with the planet editor on Steam Workshop
Share ten planets made with the planet editor on Steam Workshop
Start your 10th Terraform session
Start your 20th Terraform session
Complete the Tellus part of Terraform!
Achieve a total Terraform rating of at least 2000