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