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1) Express Train: During the ambush at the cog rail station, kill all soldiers in 60 seconds
(3:39 - 4:38)
2) No Witnesses: Don't leave any witnesses alive in Paez's HQ
(9:28 - 10:48)
3) Ace of Diamonds: Execute 10 headshots while in damond formation
(11:31 - 14:20)
Completing all of the tactical challenges will earn you several weapon attachments, as well as the 'Master Tactician' Trophy / Achievement (Complete 100% of the tactical challenges).
There are a total of 12 missions. Each one has 3 tactical challenges. If you die after completing a challenge you do not have to do it again, it will stay saved after the first completion! You can do the tactical challenges over multiple playthroughs or in Mission Selection. The chosen difficulty does not matter (only for the challenges that are tied to a difficulty - Mission 4, 6, 9, 10).
You do not have to reach the end of the mission to make the tactical challenge count. You can drop out after reaching the next checkpoint. The enemies have the same motion pattern on every difficulty.
This walkthrough was captured on Elite Difficulty (Solo) with 0 deaths.