| Achievement | How to unlock
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- Absolute Threshold ( 25 points )
| - Achieve the Gold weapon upgrade rank on the Insanity difficulty.
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- Astraphobia ( 25 points )
| - Complete one level in Story mode while only using Shock Therapy.
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- Aversion Therapy ( 15 points )
| - Complete a level on any difficulty without dying.
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| - Kill 100 Enemies while using the Dream Cleaner.
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| - Kill 100 Enemies while using the Hailstorm.
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| - Kill 100 Enemies while using the Dragon's Grasp.
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- Delusions of Grandeur ( 25 points )
| - Finish a Deathmatch game with the highest score ( with at least 3 other players involved).
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| - Kill 400 Enemies while using the Dragon's Grasp.
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- Dreamkiller ( 20 points )
| - Defeat a Dreamkiller without taking any damage.
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- Focused Mind ( 10 points )
| - Defeat a Doorkeeper without taking any damage.
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- Free Association ( 15 points )
| - Kill 3 or more opponents at the same time in a Multiplayer game.
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| - Kill 400 Enemies while using the Hailstorm.
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| - Kill 100 Enemies while using the Minigun.
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- Heavy Operator ( 15 points )
| - Kill 400 Enemies while using the Minigun.
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- Heliophobia ( 25 points )
| - Complete one level in Story mode while only using the Sunbeam.
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- Hoplophobia ( 25 points )
| - Complete one level in Story mode while only using the Minigun.
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| - Complete every level on any difficulty without dying.
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- Instinctual Action ( 25 points )
| - Enter Berserker Rage during a Multiplayer game.
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- Latent Abilities ( 25 points )
| - Complete every level on any difficulty without dying in the Subconscious.
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| - Kill 100 Enemies while using the Sunbeam.
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- Ligyrophobia ( 25 points )
| - Complete one level in Story mode while only using the Dream Cleaner.
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- Lucid Guardian ( 45 points )
| - Complete Story mode on the Insanity difficulty.
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- Manic Episode ( 15 points )
| - Enter Berserker Rage at least once in each level of the game in Story mode.
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| - Complete Chapter 4 on any difficulty.
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| - Conquer 50 brains in Conquest mode.
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| - Return your team's flag at least 5 times in one CTF match.
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| - Use every weapon at least once in any level of the game in Story mode.
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| - Complete Chapter 2 on any difficulty.
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| - Complete one level without receiving any Health pickups.
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| - Complete one level in Story mode while only using the Hailstorm.
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| - Kill 400 Enemies while using the Sunbeam.
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- Poor Sleeper ( 15 points )
| - Complete Story mode on the Bad Dream difficulty.
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- Practitioner ( 20 points )
| - Complete Chapter 1 on any difficulty.
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- Prescription ( 30 points )
| - Kill 100 opponents in any Multiplayer game mode.
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- Psycho Logical ( 25 points )
| - Complete a Single Player game in Time Trial mode.
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- Psychoanalysis ( 15 points )
| - Kill 25 opponents in any Multiplayer game mode.
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- Rhabdophobia ( 25 points )
| - Complete one level in Story mode while only using the Dragon's Grasp.
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| - Kill 100 Enemies while using Shock Therapy.
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- Simple Jack ( 25 points )
| - Complete a Single Player game in Single Weapon mode.
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- Somnambulist ( 25 points )
| - Complete Story mode on the Nightmare difficulty.
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| - Complete Chapter 3 on any difficulty.
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| - Kill 400 Enemies while using Shock Therapy.
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| - Kill 400 Enemies while using the Dream Cleaner.
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| - Kill 300 opponents in any Multiplayer game mode.
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- Untouchable ( 30 points )
| - Kill 10 opponents in a row without dying in a Multiplayer game.
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| - Find and enter in all of the Secret areas in any one level of the game.
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| - Kill 10 or more enemies at the same time with any weapon.
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