Here is the full list of all 10 Fort Sumter achievements.
Win 1 game as the Unionist
Win 1 game as the Secessionist
Win 100 games as the Unionist
Win 100 games as the Secessionist
Win 50 online games
Score all 6 VP from Objective cards in a single game
Win when your opponent has a score of 0
Skip round 3 by initiating Final Crisis early
During Crisis Dimension scoring, have 12 tokens in a single Crisis Dimension
Place 620,000 tokens on the map (one for each life lost in the Civil War)