Dead Cells achievements
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Dead Cells

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There are a maximum of 53 Dead Cells achievements worth 9,091 (1,000)

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Secret Achievement in Dead Cells

Secret Achievement1,047 (50)

Continue playing to unlock this achievement. (Secret)

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Achievement Guide for Flawless victory.

AuthorSolution
Skeptical Mario
338,067 (146,336)
Skeptical Mario
Achievement won on 13 Aug 18
TA Score for this game: 7,646
Posted on 14 August 18 at 15:28, Edited on 14 August 18 at 20:48
New solutionThis solution has 2 positive votes and 0 negative votes. Please log in to vote.
Conjunctivius is the eye-monster in the Insufferable Crypt, found by using the Ram Rune to take the lower path in the Toxic Sewers, through the Ancient Sewers.

There are two main components to the fight, which you'll want to practice several times before trying for a perfect run. Conjunctivius largely floats around the chamber attacking you, but at approximately 90% health, 70% health, and 40% health he will retreat behind a shield and summon tentacles to attack you from under the ground.

Floating phases: It will move around the chamber, periodically making these attacks.
* A ramming attack telegraphed with a ghostly red chain.
* Shooting equally-spaced green spit projectiles (more bursts at lower health).
* A close-range area-of-effect burst, telegraphed by a red circle.
* At half health or less, a long barrage of chaotic green spit projectiles reminiscent of a bullet hell. You should be doing enough damage that Conjunctivius doesn't get a chance to do this.

Tentacle phases: These phases, especially the third one, are the hard part of unlocking Flawless victory. I'll describe the tentacle behavior here.
* There are three tentacles in the first tentacle phase, four in the second, and five in the third.
* Each time you kill a tentacle, lightning flashes onto the other tentacles. The lightning doesn't hurt you; this is a brief respite.
* In general, tentacles will be submerged in the ground and follow your movement. It's unclear, but I do not think they can take damage over time while they are submerged.
* Tentacles will burst out to attack when you or a turret is over them. This is fairly easy to dodge if you keep moving.
* In the second and third phases, after the tentacles appear and after a tentacle is killed, one tentacle will make a sweeping attack that is the trickiest part of the fight. It will move, submerged, all the way to one side of the room, and then emerge and sweep across the room before submerging again and moving to your location. This attack is also easy to dodge in isolation, but in combination with avoiding the other submerged tentacles it will trip you up.

Strategy
If you're aiming specifically for this achievement, focus entirely on one stat to maximize your DPS. On my successful attempt, I went all-in on Tactics, using a Wolf Pack trap to get Conjunctivius trapped on the lower platform so I could unload a few Heavy Crossbow blasts into it at a time. The Wolf Pack also traps the moving tentacles, making that phase much easier. Of course, any ice attack is very useful for that too. I would not recommend relying on turrets or DoT effects because they can obscure the ground and you need to see where the tentacles are moving around under there.

Recommended gear (I'll add recommendations from the comments as well):
Skill: Wolf Pack
Weapon: Ice Bow
Weapon: Heavy Crossbow
Grenade: Ice Grenade
Mutation: Efficiency / Fireworks Technician
Mutation: Support
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