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