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