Here is the full list of all 18 Rochard achievements.
The base game contains 14 achievements, and there is 1 DLC pack containing 4 achievements.
Complete the game in 3 hours or less
Kill 2 or more enemies with a single exploding mechanical enemy
Collect 100% of all Gold Collectibles
Defeat Maximillian
Collect all upgrades
Kill 100 enemies using objects shot or dropped with G-Lifter
Collect 50% of all Gold Collectibles
Kill 100 enemies using the Rock Blaster
Collect 25% of all Gold Collectibles
Electrocute a human enemy
Kill a human enemy with deflected bullets
Kill a human enemy with another enemy's body
Kill an enemy by falling on him
Kill an enemy with an object shot with G-Lifter
Get through the challenge level 'Assembly Line'
Get through the challenge level 'Brainyard'
Get through the challenge level 'Shaft Shuffle'
Get through the challenge level 'Container Chaos'