Here is the full list of all 33 Furi achievements.
The base game contains 33 achievements, and there is 1 DLC pack containing 0 achievements.
Get a S rank in Furier difficulty (story mode)
Complete the game in Furier difficulty
Defend the Free World against your invasion
Get a S rank in Furi difficulty (story mode)
Accept The Song's compromise
Meet The Voice in your cell after defeating The Chain
Beat Furi’s designer’s best speedrun time: 2:12:42
Beat Furi's combat designer’s best speedrun time: 1:29:56
Break all of The Line's shields before hitting him
Parry the same bullet 3 times after it bounces back from The Hand's shield
Parry 20 bullets against a guardian in one fight without game over
Defeat a guardian without taking any hits
Hit one guardian 10 times with a boost hit in one fight without game over
Hit a guardian 10 times with a melee attack in one fight without game over
Assimilate the Free World and make it your home
Get an A rank in Furi difficulty (story mode)
Meet with The Voice in the Free World
Turn your armor's light ON during a path
Defeat The Beat
Defeat a guardian within 5 minutes
Defeat The Edge
Parry 20 consecutive hits against a guardian without getting hit
Defeat The Burst
Defeat The Song
Defeat The Hand
Achieve 5 perfect parries during one fight against a guardian
Defeat The Scale
Defeat The Line
Keep the armor glowing at maximum level for one full phase
Defeat The Strap
Rise from a K.O. 20 times
Defeat The Chain
Grab 10 heal pickups during a fight