Here is the full list of all 27 Bridges & Docks achievements.
Place 200 Bridges
Generate An Island With 15 Bridges
Place Every Kind Of Animal
Place 50 Bridges
Place 50 Houses
Use The Undo Button 5000 Times
Place a Bridge 15 Blocks High
Place 50000 Blocks
Place 10000 Blocks
Place Grass 100 Times
Place 50 Rocks
Change Color Palette 20 Times
Take 10 Screenshots
Max out every slider
Maximize Fish Quantity
Generate An Island With 100 Houses
Hit The Generate Button 50 Times
Use The Undo Button 100 Times
Place 50 Sheep
Overwrite a Save File
Generate an island with no land
Generate An Island With 300 Trees
Hit The Generate Button 1 Times
Rotate An Object 5 Times In Under 2 Seconds
Place 5 Bridges
Place 1000 Blocks
Place 10 Blocks