Here is the full list of all 26 Steamroll achievements.
Get all 3 awards in Level 18
Get all 3 awards in Level 17
Get all 3 awards in Level 16
Find the pieces of the broken driller.
Get all 3 awards in Level 15
Get Valuska's driller back to you.
Get all 3 awards in Level 14
Get all 3 awards in Level 13
Get all 3 awards in Level 12
Rescue Garcia from her Scarabeus.
Get all 3 awards in Level 11
Make Garcia unlock your path.
Get all 3 awards in Level 10
Unlock Garcia's Scarabeus.
Get all 3 awards in Level 9
Get all 3 awards in Level 8
Get all 3 awards in Level 7
Get all 3 awards in Level 6
Break the rocks in the corridor.
Get all 3 awards in Level 5
Get all 3 awards in Level 4
Get all 3 awards in Level 3
Get all 3 awards in Level 2
Get all 3 awards in Level 1
Destroy the main elevator.