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.
Built a bridge with at least 100 construction elements.
Spent at least 100,000 for a bridge.
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.
Ran a level simulation although not one single element had been built.
One vehicle reached the opposite side of the bridge safely, the other did not.
Achieved 90 badges!
Cars can drive on all of Island 2's bridges.
Trucks can drive on all of Island 3's bridges.
Built a truck bridge which withstands over 95% strain without anything breaking.
Trucks can drive on all of Island 2's bridges.
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!
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.