Here is the full list of all 19 捜査官の試練INVESTIGATOR TRIALS achievements.
Complete the first transformation
Defeat the mechanical creature Scorpion
Defeat the Mechanical Mantis
Defeat the Mechanical Eagle
Defeat No.9527
Defeat the Elite Double Gun Guard
Obtaining life potion for the first time
Obtain all life potions
Obtaining energy mixture for the first time
Obtain all energy agents
Hit by mechanical snail self explosion
Obtain all door cards
First game failure
Punishment A
Punishment B
Punishment C
Punishment D
Punishment E
Using health or energy agents more than 50 times