Ghostrunner

NOTE: This achievement can be unlocked by doing the first level of the base game deathless (though per KUZI22 you might have to delete your save data if you want to get the achievement this way). IT DOESN’T SEEM LIKE ONE MORE LEVEL HAVE ANY INTENTION OF PATCHING THIS OUT, but if you want to do this the intended way, check the main guide below.
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This is perfectly obtainable on a fresh file, but if you want to get this out of the way quickly I would recommend waiting until you get your last batch of upgrades before doing this, as said batch includes (imo) the most powerful upgrade in the game, across both the base game and DLC.

The upgrades for this build are the following:

• Raging Dash (dash recharges faster while you are Enraged)
• Dash: Extra Charge
• Rage: Relentless (the faster you move the slower the Rage Meter decays)
• Shield: Secondary Reactor (Rage Meter is reset to 30% (instead of 0%) when the Deflector Shield is hit)

The upgrades have also been placed in a way that means that you will also get access to two of the three Rage Module upgrades as well (can see enemies through walls while Enraged and be briefly invincible when your Shield is hit. In regards to where you should put them to get the bonuses, put Secondary Reactor at the right of the grid; Relentless top of the grid; Extra Charge bottom left of the grid; and Raging Dash left of the grid.

This build allows you to keep up your Shield very often; one kill after losing your Shield will reactivate it. As for using Relentless to its fullest, I would recommend jumping most of the time, as it'll give you a good and consistent speed boost. Due to this build, none of the combat encounters are that bad (and I'd argue they're not that bad in general) however if you're struggling with the electric platform section, there is an alternative (albeit risky) method to get through: wall run on the sides of the platforms. (I'd put in a visual representation of this but I've had two clips of it go kaput here now so you'll have to practice it yourself. Sorry.)

Miscellaneous tips to round this off:

• Use Hel's Surge during Sensory Boost to use it more accurately (I would only recommend using it in the final combat encounter though)
• You can skip the first two combat encounters after taking care of the shield drone
• For the unaware, if you activate Sensory Boost while in sight of a Splitter (the enemy that splits into 5 versions of itself when you get close), you will notice one is shaded in red. The shaded Splitters are the real ones, just dash to it and you can take it out without hitting any of the clones.

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EDIT (5/4/22): Clips seem to have went kaput for some reason, have removed them and am gonna see on recording some replicas. —————————————————————————————————————————
EDIT (8/4/22): Put in a replica of the second clip and keeping the text as a replacement of the first as I don’t think the clip is required; worst case scenario is having to fiddle the pieces for like 2 minutes at most.—————————————————————————————————————————
EDIT (10/5/22): Second clip went kaput again, removed with a note that you'll have to practice it yourself instead.