-Flaws are typically acquired by repeating something negative many times. They change your characters attributes slightly and reward you with a free perk point.
-Flaws are completely optional and can be rejected, and although this achievement is missable, by the end of the game you will likely have encountered more than 3 phobia prompts. Flaws MUST be accepted to count toward the achievement,
-Flaws are limited to 3 on normal, 4 on hard, and 5 on supernova.
-Phobias are flaws that give you -1 Perception, -1 Dexterity, and -1 Temperament when in the presence of the source of the Phobia. (Raptidons for raptiphobia, etc.)
-Flaws appear to trigger on a cooldown, meaning, for example, Acrophobia cannot be acquired by repeated purposeful falls.
Acrophobia - Taking too much fall damage.
Cynophobia - Taking too much damage from canids.
Paranoid - Being caught committing crimes too often.
Robophobia - Taking too much damage from robots.
Herpetophobia - Taking too much damage from mantisaurs.
Raptiphobia - Taking too much damage from raptidons.
Addiction Withdrawal - Too many consumed meds.
Permanent Concussion - Taking too much damage to the head.
(Damage Type) Weakness - Taking too much (Plasma, N-Ray, Fire, etc.) damage.
Pithecophobia - Taking too damage from primals.
Physical Damage Weakness - Taking too much physical damage.
Permanently Crippled - Taking too much damage to the legs. (Crippled Status.)
Partially Blind - Taking too much damage to your eyes. (Blinded status.)
Permanently Maimed - Taking to much damage to the arms.
-It is my personal opinion that Phobias are your best choice as to not inhibit the rest of your playthrough, as they have no adverse effects outside of combat.
*If anyone has found more, please let me know and I will add them to the list.