The Skirmish Pack Add-on for Battle of Empires : 1914-1918 has 10 achievements.
Play at least once in Trench Assault mode.
Play in Trench Assault in a team of four players.
Play in Trench Assault in a team of three players.
Play in Trench Assault in a team of two players.
Play "Team Defence" mode
Survive 5 waves in the "Team Defence" mode
Survive 10 waves in the "Team Defence" mode
Survive 15 waves in the "Team Defence" mode
Survive 20 waves in the "Team Defence" mode
Survive all the waves in the "Team Defence" mode