The The Under Games Expansion Add-on for War for the Overworld has 39 achievements.
Win the first arena of The Under Games as Volta
Win the second arena of The Under Games as Volta
Win the third arena of The Under Games as Volta
Win the fourth arena of The Under Games as Volta
Win the quarter-final of The Under Games as Volta
Win the semi-final of The Under Games as Volta
Win The Under Games as Volta
Win the first arena of The Under Games as Lamash
Win the second arena of The Under Games as Lamash
Win the third arena of The Under Games as Lamash
Win the fourth arena of The Under Games as Lamash
Win the quarter-final of The Under Games as Lamash
Win the semi-final of The Under Games as Lamash
Win The Under Games as Lamash
Win the first arena of The Under Games as Shale
Win the second arena of The Under Games as Shale
Win the third arena of The Under Games as Shale
Win the fourth arena of The Under Games as Shale
Win the quarter-final of The Under Games as Shale
Win the semi-final of The Under Games as Shale
Win The Under Games as Shale
Win the first arena of The Under Games as Kasita
Win the second arena of The Under Games as Kasita
Win the third arena of The Under Games as Kasita
Win the fourth arena of The Under Games as Kasita
Win the quarter-final of The Under Games as Kasita
Win the semi-final of The Under Games as Kasita
Win The Under Games as Kasita
Win the first arena of The Under Games on Master difficulty
Win the second arena of The Under Games on Master difficulty
Win the third arena of The Under Games on Master difficulty
Win the fourth arena of The Under Games on Master difficulty
Win the quarter-final of The Under Games on Master difficulty
Win the semi-final of The Under Games on Master difficulty
Win the The Under Games on Master difficulty
Beat Lamash on Hard difficulty on any official 1v1 Skirmish map
Beat Volta on Hard difficulty on any official 1v1 Skirmish map
Beat Zeam on Hard difficulty on any official 1v1 Skirmish map
Beat Shale on Hard difficulty on any official 1v1 Skirmish map