Here is the full list of all 31 Mech Mechanic Simulator achievements.
Refurbish your first mech.
Finish a job with a unique mech.
Finish a time-limited task in a job.
Finish a software replacement job.
Finish a job with dynamic tasks.
Finish a job for the Cyb3r M3chs.
Paint a mech.
Finish a job with an advanced mech.
Finish all bonus tasks in a job.
Buy your first station.
Repaint your workshop.
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.
Create 10 parts in the crafting station.
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.
Successfully finish 1000 jobs.
Earn more than $1,000,000.
Buy and refurbish all mech types.
Managed to break the economy