Here is the full list of all 52 9th Sentinel Sisters achievements.
Reach level 5
Reach level 10
Reach level 20
Reach level 40
Reach level 60
Reach level 80
Clear the route Ops #1 "Patrol"
Clear the square for the first time
Clear any route with the character "Saika"
Clear any route with the character "Yayoi"
Raise your weapon to the maximum level
Get 6 weapons
Use 5 kinds of parts
Use 10 kinds of parts
Use 20 kinds of parts
Use 30 kinds of parts
Raise the parts to the maximum level
Defeated 1000 enemies in total
Defeated 5,000 enemies in total
Defeated 10,000 enemies in total
Defeated 50,000 enemies in total
Defeated 100,000 enemies in total
The acquired junk exceeds 10,000
The acquired junk exceeds 100,000
The rank of fuselge remodeling reaches the maximum
The rank of weapon remodeling reaches the maximum
The number of sorties exceeded 10 times
The number of sorties exceeded 50 times
The number of sorties exceeded 100 times
The number of sorties exceeded 300 times
Open a surprise box for the first time
Open the gold supply box for the first time
Open 50 surprise boxes
Open 300 surprise boxes
Watch Trace Reaction 30 times
Watch Trace Reaction 100 times
Defeat 1000 bodies in one battle
Clear the battle with 5 % or less HP
The level of assault rifle reaches the maximum
Clear any route with the character "Fem"
The level of the bazooka reaches the maximum
The level of the missile reaches the maximum
The level of the shotgun reaches the maximum
The level of the railgun reaches the maximum
The level of electromagnetic reaches the maximum
Laser level reaches the maximum
The level of the ninja boomerang reaches the maximum
The level of the drill reaches the maximum
The level of the plasma cannon reaches the maximum
The level of the iai blade reaches the maximum
The level of the rolling cutter reaches the maximum
The level of the energy field reaches the maximum