Here is the full list of all 14 Hello Engineer: Scrap Machines Constructor achievements.
No boys allowed!
Spend three hours in the sandbox
Someone’s watching you.
The third act completed
Destroy two drones in 10 seconds
The second act completed
The first act completed
Get a complicated mechanism up and running. Up to 8 running engines.
Drive 100 meters in the upside-down position
Complete any level in 15 seconds or less
Flip a car upside down and recover
Stay in air without jets for 4 seconds
Connect 10 parts
Release a vehicle with two connected driver seats