Card

The hermit when all cards are found.

Cards in Underhell are modern playing cards that are treated as collectible items in Underhell Chapter One. It is unlocked when you accepted the Hermit's mission on finding a new deck of cards because his cards were chewed through by a rat.

After collecting the deck of cards and bringing them to the Hermit, he will have Jake shuffle the cards and perform his magic trick. Additionally, a special card can be found to unlock an additional scene with the Hermit along with the "Family Photo" acheivement.

Achievements Page:

http://underhellmod.wikia.com/wiki/Achievements

Card Locations

East Wing{1} {1 Total}

[J of Hearts] Inside security room drawers below hermit's lair.

West Block{2} {3 Total}

[4 of Hearts] Inside green lockers of storage room.
[3 of Hearts] Inside right security room lockers.

- Where the keys are found.

Canteen{1} {4 Total}

[A of Hearts] Under a bowl on a table.

High Security Block{3} {7 Total}

[8 of Hearts] Inside barricaded security checkpoint.

- Just under hermit's lair in High Security block.

[7 of Spades] In drawers inside power room checkpoint.
[K of Spades] In the middle drawer in the Warden's Office.

North Wing{6} {13 Total}

[Q of Clubs] Inside the locked security room drawer.

-Wrench needed

[9 of Clubs] Inside the drawer of the control room upstairs. (The one with the red door)
[9 of Clubs] Inside security checkpoint with a bathroom. (Alternative)

[2 of Hearts] On the black footlocker in the downstairs infirmary.

[3 of Spades] On the map legend near the level one access. (Middle of the 2 L's)

[4 of Diamonds] On the middle bench inside the locker room after opening the canteen door.

-Canteen door is the door with a code needed

[K of Hearts] On the Infirmary near the power room.

-The Infirmary is near Malcom's position (not in his side)

Maintenance Access{1} {14 Total}

[K of Spades] On the lobby desk near the train station.

Maintenance Quarters{6} {20 Total}

[2 of Spades] In the security room drawer.
[3 of Diamonds] In the footlocker of the locker area.
[Q of Spades] In the footlocker inside the bathroom.
[6 of Spades] Inside the dumpster near the Hermit's hideout.

-Wrench needed

[4 of Spades] On the footlocker near the dormitories.
[J of Spades] Inside the drawer near the generator room.

Maintenance Lower Labs{5} {25 Total}

[6 of Diamonds] Inside the security room near the Northern Labs.
[5 of Clubs] Inside the laboratory near the Northern Labs storage.
[8 of Diamonds] Inside the Southern Labs.
[10 of Diamonds] Inside the Southern Labs with the coded door.
[A of Diamonds] Inside the Northern Biolabs

-Gas Mask needed

MGPS{1} {26 Total}

[A of Clubs] On the console of the upstairs control room.

The Core{1} {27 Total}

[J of Diamonds] Inside the Helicopter.

Shooting Range{3} {30 Total}

[Q of Diamonds] Inside the drawer in the control room.
[5 of Spades] On foot locker inside the shooting area.
[7 of Diamonds] Behind one of the targets of the shooting area.

East Wing{7} {37 Total}

[9 of Diamonds] Over the boxes of the 2nd storage room.
[7 of Hearts] On the printer inside the offices near the workshop.
[Q of Hearts] On the lobby desk outside medical bay.
[7 of Clubs] On a footlocker inside the dormitories.
[2 of Diamonds] On a clinic desk inside the medical bay.
[9 of Spades] Inside drawers outside medical bay lobby.
[6 of Hearts] On the desk of medical bay waiting area.

Residential Area{5} {42 Total}

[3 of Clubs] On a footlocker near the swimming pool.
[8 of Clubs] In security room inside medical bay.
[10 of Hearts] At refrigerator inside restaurant kitchen.
[5 of Hearts] At mirror cabinet inside level 1 bathroom.
[6 of Clubs] On level 1 bench.

Oxygen Room{6} {48 Total}

[9 of Hearts] On desk near campfire.
[2 of Clubs] Under the stairs near checkpoint.
[J of Clubs] Inside the drawers in control room.
[5 of Diamonds] On the desk near cypher repair station.
[8 of Spades] On the highboxes near the control room.
[10 of Clubs] Inside the footlocker in locker room.

Offices{4} {52 Total}

[A of Spades] At the board inside conference room.
[10 of Spades] On the security checkpoint near North Wing access.
[4 of Clubs] Near the oven inside the kitchen.
[K of Diamonds] In drawers inside Terry's office.

Additional Info

After collecting all 52 cards, another card, the Hermit's card, can be collected so the achievement "Family Photo" is completed. It will be next to the Diary when Ito talks to you.
The Dumpster card in the Maintenance quarters is not very noticeable at low video settings. If this happens keep on pressing your use key until you find it.
The Highboxes card inside the oxygen room can be collected if you jump over the ledge outside the control room.
The locker room in the oxygen room is not immediately accessable upon arriving. The room can be accessed and Takeo can be found there shortly before his reveal scene.