Here is the full list of all 31 Mech Mechanic Simulator achievements.
Paint a mech.
Finish all bonus tasks in a job.
Buy your first station.
Buy the mechanic's license.
Clean a mech from dirt and mud.
Successfully finish 10 "Arena" missions with 4 threats.
Successfully finish 10 "Covert" missions with 4 threats.
Successfully finish 10 "Mining" missions with 4 threats.
Successfully finish 10 "Scavenge" missions with 4 threats.
Successfully finish 10 "Illegal" missions with 4 threats.
Successfully finish 10 "Distress" missions with 4 threats.
Mount each of the perks at least once.
Successfully finish each of the mission types with 4 threats.
Fix each mech type at least once.
Earn the max prestige level.
Refurbish your first mech.
Create 10 parts in the crafting station.
Finish a time-limited task in a job.
Finish a job with dynamic tasks.
Finish a job for the Cyb3r M3chs.
Weld 100 parts in the welding station.
Remove the rust from 100 parts in the De-rusting station.
Fix 100 parts in the electronics station.
Repaint your workshop.
Successfully finish 1000 jobs.
Earn more than $1,000,000.
Finish a software replacement job.
Buy and refurbish all mech types.
Finish a job with an advanced mech.
Finish a job with a unique mech.
Managed to break the economy