Here is the full list of all 45 Beyond Flesh and Blood achievements.
Sync kill 50 enemies
Kill 50 Rebels
Kill 30 Screechers
Kill 10 Shrieker Swarms
Kill 10 Adult Shriekers
Kill 30 enemies with the Shotgun
Kill 30 enemies with the Assault Rifle
Kill 30 enemies with the Sniper Rifle
Kill 30 enemies with the Minigun
30 headshots with Sniper Rifle
Kill 4 enemies at once by throwing a box
Kill 6 enemies at once by throwing an exploding barrel
Impale 5 enemies at once by throwing a pole
Set 4 enemies on fire at once with a molotov cocktail
Kill 4 enemies in a row that are on fire
Kill 4 enemies at once in a drone explosion
Kill 30 enemies whilst piloting Manned Mechs
Sync kill a rebel heavy
Find 25% of all data logs
Find 50% of all data logs
Complete Act 1 on any difficulty
Complete Act 2 on any difficulty
Complete Act 3 on any difficulty
Complete Act 4 on any difficulty
Complete Act 5 on any difficulty
Complete All Acts on any difficulty
Call in and raise your 1st signal tower
Using missiles lock on to 6 separate targets and eliminate them
Complete 5 waves in a row without dying
Dismember 30 enemies during overkill cams
Choose to save / defend the pinned-down UGR squad
Kill 5 enemies at once with a ground pound
Finish the game on any difficulty
Find all data logs
Complete 50% of chapters at grade S
Complete a Wave Survival map
Drop a cargo container in the container yard to kill 3 enemies at once
Reach a combo multiplier of x20
Defeat the Nemesis Titan
Kill 6 enemies during 1 slow mo burst
Ground pound and kill 3 enemies before they hit the ground
Kill a rebel mech with a ground pound
Finish the game on highest difficulty
Complete 100% of chapters at grade S
Completed a Wave Survival map without continuing