Here is the full list of all 30 Bright Memory: Infinite achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Defeat the Tian Yu Emperor
Use “Defend” to deflect 20 enemy bullets
Sever 100 enemy limbs using weapons or skills
Defeat 80 enemies using your assault rifle
Sever 50 enemy limbs using weapons or skills
Kill the Tian Yu Emperor
Kill the Giant King
Kill the Six-armed Emperor
Clear the game
Clear the game on “Revenge” difficulty
Clear the game on “Hell” difficulty
Defeat 20 enemies using flame-type weapons or skills
Assassinate 14 people without being spotted by the enemy in the “Surrounded” infiltration mission
Activate “Counter” 50 times
Activate “Counter” 100 times
Defeat 80 enemies using any skill
Defeat 150 enemies using any skill
Defeat 150 enemies using your assault rifle
Defeat 80 enemies using your shotgun
Defeat 150 enemies using your shotgun
Defeat 50 enemies using your handgun
Defeat 100 enemies using your handgun
Defeat 50 enemies using your sniper rifle
Defeat 100 enemies using your sniper rifle
Destroy 5 enemy vehicles with missiles during the car chase
Acquire 20 “Reliquaries”
Acquire 50 “Reliquaries”
Acquire 100 “Relics”
Unlock “Blade Slash Whirlwind: Lv.3”
Unlock “Rocket Punch: Lv.3”