Here is the full list of all 26 The Bluecoats - there are North vs South achievements worth 1,000 gamerscore.
Win 25 games in solo mode
Win 10 games as a Confederate in solo mode
Capture 250 states in solo mode
Win 15 battles in solo mode
Win a fort attack in solo mode 15 times (attack or defense)
Win 3 consecutive games against a strong AI in solo mode
Win 10 games as a Yankee in solo mode
Win 10 games in solo mode
Control 3 large armies simultaneously in solo mode
Capture 100 states in solo mode
Finish a first game with 2 players
Finish a game in less than 5 months in solo mode
Control all 5 Forts simultaneously in solo mode
Win a fort attack in solo mode once (attack or defense)
Win a train attack in solo mode once (attack or defense)
Win 1 game in solo mode
Capture 25 states in solo mode
Win 1 battle in solo mode
Win 10 maximum difficulty games in solo mode
Win 1 game in each difficulty level in solo mode
Win 50 battles in solo mode
Win a fort attack in solo mode 50 times (attack or defense)
Win a train attack in solo mode 15 times (attack or defense)
Win a train attack in solo mode 50 times (attack or defense)
Play 10 games with 2 players
Play 25 games with 2 players