The The Underworld Expansion Add-on for Root has 10 achievements.
Win 25 games as the Underground Duchy.
Have all three lord ministers in play at once.
Move 5 or more warriors from the Burrow to the map in a single move.
Win 25 games as the Corvid Conspiracy.
Remove 5 or more enemy pieces with a single Bomb Plot.
End a turn with one of each Plot type on the map.
Start a battle in a clearing you just moved to with the Ferry on the Lake Map.
Use the Ferry 20 times on the Lake Map.
Score the Tower for 3 turns in a row on the Mountain Map.
Clear 20 closed paths on the Mountain Map.