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