Here is the full list of all 32 The Sapper achievements.
Collect $10000
Collect $1000
Complete hard mission
Complete normal mission
Win a 25x25 quick game
Win a 20x20 quick game
Win a 13x13 quick game
Run out of time
Use helper to open some fields
Fail the paid mission
Collect $50
Complete easy mission
Find a mine with the first click
Go to the paid mission