Here is the full list of all 21 Bridge Constructor Playground achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Cars can drive on all of Island 4's bridges.
Trucks can drive on all of Island 4's bSouths.
Completed all levels with trucks.
One vehicle reached the opposite side of the bridge safely, the other did not.
Cars can drive on all of Island 2's bridges.
Trucks can drive on all of Island 3's bridges.
Achieved 90 badges!
Ran a level simulation although not one single element had been built.
Spent at least 100,000 for a bridge.
Trucks can drive on all of Island 2's bridges.
Built a truck bridge which withstands over 95% strain without anything breaking.
Achieved 55 badges!
Cars can drive on all of Island 1's bridges.
Trucks can drive on all of Island 1's bridges.
Achieved 25 badges!
Achieved all badges for all bridges!
Built a bridge with at least 100 construction elements.
25 failed simulations in a row for the same bridge.
Bridge completed although at least 1 part broke.
A vehicle flew at least 5 grid units into the air.