Building Bridges Achievement
Place one of each bridge in each kingdom
For Building bridges, you have to build one vertical bridge in the Frozen land (story related, can't be missed), one vertical bridge in the Desert Land (story related, can't be missed), and one vertical and one horizontal bridge in the Forrest Land. Once you pust the last bridge in place, the achievement will pop.
Credit to forum user "DM HavoX" for this solution!