Here is the full list of all 41 TASTEE: Lethal Tactics achievements.
Recruit Seraphim
Shoot an Enemy with Seraphim's Marksman Ability
Recruit Augustus
Complete All Bonus Objectives in a Mission at Once
Kill an Enemy With The Baron's Impact Grenade
Complete Your First Mission
Mark a Target with the Ares' Tracking Ability
Breach Through an Obstacle With Linus' Breach Ability
Complete the Tutorial
Detect an Enemy With Augustus' Scout Ability
Detect an Enemy With Zeke's Sensor
Survive a Sniper's Bullet With Hoser's Tough ability
Blind an Enemy With Denton's Flashbang
Hit an Enemy with Bodark's Disarming Shot Ability
Evade an Enemy with Hyde's Vanish Ability
Kill an Enemy With Hudson's Proximity Mine
Kill an Enemy With Hindenburg's Big Explosions Grenade
Win 10 Practice Matches
Win 1 Online Match
Win 10 Online Matches
Win an Online Match On All Maps
Win 1 Cage Match
Complete 5 Missions
Complete 10 Missions
Complete 15 Missions
Complete 20 Missions
Kill the Cowboy (Complete Mission 30)
Complete a Mission with 3 Bombers
Complete a Mission with 3 Shotgunners
Complete a Mission with 3 Snipers
Complete a Mission with 3 Gunmen
Complete a Mission With Only One Merc
Win 20 Online Matches
Win 30 Online Matches
Win 50 Online Matches
Recruit Hindenburg
Recruit Hudson
Recruit Hoser
Recruit Hyde
Recruit Bodark
Recruit Zeke