Here is the full list of all 64 Breach & Clear achievements.
Use a grenade.
Clear a single location.
Score an assist by having two soldiers target the same enemy.
Defeat three enemies in one turn.
Earn four stars across every mission (Kabul, Turkey, and South China Sea – any difficulty).
Earn four stars across any mission (any difficulty).
Create a squad for each faction (SEALs, Rangers, SF, and JTF2).
Successfully complete every mission (Kabul, Turkey, and South China Sea – any difficulty).
Earn four stars across every mission on every difficulty (Kabul, Turkey, and South China Sea).
Use any tactic.
Visit Kabul, Turkey, and the South China Sea.
Use each breach type once.
Defeat four enemies in one turn.
Defeat five enemies in one turn.
Defeat six enemies in one turn.
Take no damage during a mission with 10 or more enemies.
Take no damage during a mission.
Perform an explosive breach that kills two enemies.
Have a single teammate complete a location with low health.
Level a soldier up to level 15.
Level an Intelligence Specialist to level 30.
Level a Weapons Sergeant to level 30.
Level a Fireteam Leader to level 30.
Level a Breacher to level 30.
Level a Medic to level 30.
Level a Direct Action Specialist to level 30.
Defeat 100 enemies with grenades.
Stun 100 enemies with flashbangs or breach charges.
Defeat 100 enemies.
Defeat 500 enemies.
Defeat 1,000 enemies.
Defeat 5,000 enemies.
Defeat 10,000 enemies.
Defeat 53,594 enemies.
Clear 100 locations.
Clear 500 locations.
Clear 1,000 locations.
Have a bullet hit the CEO portrait in Kabul.
Completely clear a location in five seconds or less.
Defeat 50 enemies with shotguns.
Defeat 100 enemies with shotguns.
Defeat 250 enemies with shotguns.
Earn a total of 550 stars.
Earn a total of 800 stars.
Earn a total of 1400 stars.
Earn a total of 1700 stars.
Defuse 100 bombs.
Defuse 250 bombs.
Complete all Terrorist Hunt missions on medium difficulty or higher.
Complete all Bomb Defusal missions on medium difficulty or higher.
Complete all Escape Plan missions on medium difficulty or higher.
Complete 15 missions on medium difficulty or higher without taking damage.
Defeat 50 enemy Shapeforms.
Defeat 100 enemy Shapeforms.
Defeat 150 enemy Shapeforms.
Clear Frozen Synapse locations 5 times.
Clear Frozen Synapse locations 20 times.
Clear Frozen Synapse locations 40 times.
Create a Petrov's Shard team.
Clear a Frozen Synapse location with Petrov's Shard.
Clear a Frozen Synapse location with any team except Petrov's Shard.
Clear a Frozen Synapse location in Bomb Defusal.
Clear a Frozen Synapse location in Escape Plan.
Clear a Frozen Synapse location in Terrorist Hunt.