Resident Evil 5

You must have an overall score of S when you reach the score screen at the end of the story. I recommend playing the DLC on Amateur difficulty when going for an S rank. S ranks in Resident Evil 5 and its DLC are based on 5 criteria:

AIM: How well you are at aiming. Headshots in RE5 are what can boost your score in this criteria but in Lost In Nightmares since Guardians of Insanity are the only enemy you encounter, you must shoot them in the bulging eye that's on their backs.

ENEMIES ROUTED: This is basically how many enemies you kill. It's best to fight rather than run when you encounter Guardians of Insanity, with the shotgun being the most effective weapon to use.

DAMAGE TAKEN: Pretty self-explanatory. This is how much damage you receive from enemies. For that reason, you'll have to be swift when fighting enemies, trying your best not to get into the Guardian of Insanity’s clutches and move out of the way quickly when they slam down their weapon.

SCORE: What your collected score is. Whenever you defeat an enemy, they drop a Score Star, usually with a score of about 1,000-2,000 points. If you're paranoid and feel that won't be enough, feel free to pick up all the hidden Score Stars (required for Wish Upon a Star), but it really isn't necessary. However, if you do happen to pass one on your travels, don’t hesitate to pick it up.

TIME: How long it takes you to complete the chapter. For this criteria alone it is recommended that you do this trophy last; as you should then know the locations and areas good enough to know what to do without having to stop and think.

Below I have given simple notes of where to go and what to get; considering Time is an important factor it can be easy to become stumped on what to do next.

Recommended path to take:

Difficulty: Amateur / Character recommendation: Jill

> Lever behind the stairs on the ground floor (unlocks upstairs doors)
> Go upstairs
> Pass through previously-locked door on the right; to bedroom
> Pick up weapon and 1st PASSWORD in book
> Return to main hall, second floor
> Ammo by dead bodies; use a partner leap over the broken walkway
> Jill goes through door; unlocks door on the floor below
> 2nd PASSWORD for puzzle in small room in back
> To piano room
> Play piano; pick up EMBLEM, Guardian of Insanity spawns
> Back to main hall; use Emblem on opposite door
> Ignore locked door; run to the end of the hallway, go through the door and pick up 3rd and final PASSWORD and weapon
> Back to locked door; Jill unlocks it
> Input all 3 PASSWORDS
> Timed run to lever; partner in danger shoots the lock off the door through the bars; other partner runs to door, passes through and pulls lever
> Now safe, partner in the room picks up CRANK in the safe
> Back to area behind the stairs (main hall)
> Use CRANK, go through door

1st half finished~

> Keep running; pass drawbridge into large room with 2 Guardians of Insanity
> Grab first EMBLEM along the left path
> Boost Jill up to grab 2nd EMBLEM in centre pillar
> Ignore Guardians of Insanity; run to door
> Insert both EMBLEMS
> Run through *Cutscene*

> Reunite with partner
> Find cranks accordingly; if playing on Amateur as advised you should only need either the RED or BLUE crank; BLUE CRANK PUZZLE to the north-west of the map; RED CRANK PUZZLE to the north-east of the map, find whichever CRANK you need in the room atop the exit at north
> Insert the EMBLEM you find from luring the Guardian of Insanity into the slot in the north of the map
> Climb ladder
> Run up stairs; pick up a HANDGUN; one for each character; there is also a FIRST-AID SPRAY  on the ground; continue onwards
> *Cutscene* Boss fight: Wesker
As to not harm your Aim and Damage criteria in this run, I recommend just wasting time by running away from him until the final cutscene ensues

END - If you have S rank at the score screen, then you will unlock It's Just A Bad Dream!