Here is the full list of all 14 Oil Baron achievements.
The base game contains 7 achievements, and there is 1 DLC pack containing 7 achievements.
Level 6
Level 3
Level 4
Level 2
Level 5
Level 1
Level 7
Your first mole
Your first home
The garage is not bad
So you bought a house
And this house better
cottage
So it will go faster