Here is the full list of all 15 Strategy & Tactics: Wargame Collection achievements.
Spend 10000 technology points
Destroy 12 tank divisions in one turn
Spend over 9000 resources
Complete 15 missions in different campaigns with gold medal
«Twilight of the Gods»
«Victory Day»
«Roads of Freedom»
«Eastern Front»
Lose 100 divisions
«The Birth of Tragedy»
Complete 1 mission in any campaign with a gold medal
Complete all 33 missions in all campaigns with gold medals
Complete any 10 scenarios with gold medals
Earn rank 10
Play 1000 turns