Here is the full list of all 13 Fleshlight Squad - there are Fleshlightize - there are achievements.
Defeated the first level boss
Defeated the second level boss
Defeated the last boss
Defeated the shopkeeper
Learned the skill "Give up"
Obtained a 4-star weapon
Obtained a legendary weapon
View the H event 1-1
View the H event 1-3
View the H event 2-2
View the H event 2-3
View the H event 3-5
View the H event 3-6