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Obtain all treasures in the game.

Can take some time to collect. FYI there are 50 treasures that DO NOT fill the entire grid. You should have 4 spaces left.

Once you've collected all the treasure, take a trip to your item management to unlock the achievement.

Go here for a guide:
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[ ] - Gold Ring - Chapter 1-1 Kill The Executioner
[ ] - Ivory Relief - Chapter 1-2 Dropped by the blonde woman
[ ] - Dead Bride's Necklace - Chapter 5-2 On Final Conveyer belt
[ ] - Royal Necklace - Chapter 5-3, in a room full of rocket zombies.
[ ] - Jewel Bangle - Kill a Big Man Manjini (Big guy in white shorts)
[ ] - Venom Fang - Kill a Chainsaw Manjini (First one won't drop it)
[ ] - Antique Clock - Chapter 1-2 Balcony of locked on the inside house.
[ ] - Chalice (Silver) - Chapter 3-1 Middle island
[ ] - Chalice (Gold) - Chapter 5-3 In a locker where you lower the bridge
[ ] - Silver Idol - Chapter 3-1 Northwest Island, Assist jump to left house
[ ] - Gold Idol - Chapter 4-2, 3rd mirror light puzzle. Shine the light beams into the crystal instead of the destination mirror.
[ ] - Ceremonial Mask - Chapter 3-1, cave at the end of the chapter.
[ ] - Jewel Beetle - Chapter 3-2 Top of the oil drums at the Tricell camp
[ ] - Brown Beetle - Chapter 3-1. Small island you start the chapter on.
[ ] - Gold Beetle - Chapter 4-2, 3rd mirror light puzzle. Shine the light
beams into the crystal instead of the destination mirror.

[ ] - Topaz (Pear)- Many Places
[ ] - Ruby (Pear) - Many Places
[ ] - Sapphire (Pear) - Many Places
[ ] - Emerald (Pear) - Many Places
[ ] - Diamond (Pear) - Chapter 2-2 After the Irvine Scene, look for a
shining circle on the mountian wall.

[ ] - Topaz (Square) - Many Places
[ ] - Ruby (Square) - Many Places
[ ] - Sapphire (Square) - Many Places
[ ] - Emerald (Square) - Many Places
[ ] - Diamond (Square) - Chapter 2-2 After the Irvine Scene, look for a
shining circle on the mountian wall. This one requires an assist
jump

[ ] - Topaz (Oval) - Chapter 6-1 After activating the switch to pick the
the cage up, you will run into some zombies, one will drop this.
[ ] - Ruby (Oval) - Chapter 4-1 Under red statue in the Labyrinth.
[ ] - Sapphire (Oval) - Chapter 5-3 Wesker/Jill fight after Wesker kicks
you through the door, follow the corridor into the room
full of coffins. Break small pot on your right.
[ ] - Emerald (Oval) - Chapter 5-3 Wesker/Jill fight after Wesker kicks
you through the door, follow the corridor into the 2nd room full
of coffins. In the coffin that needs an assist to open.
[ ] - Diamond (Oval) - Chapter 2-2 In the mines just before the crank
at the exit, hidden hall to the left.

[ ] - Topaz (Trilliant) - Chapter 4-1 At the start run by the ladder you
are suppose to climb up. It is in a treasure box.
[ ] - Ruby (Trilliant) - Chapter 4-1 After you fall from the empty coffin
trap. It's in one of the treasure chests.
[ ] - Sapphire (Trilliant) - Chapter 4-1 After you fall from the empty coffin
trap. It's in one of the treasure chests.
[ ] - Emerald (Trilliant) - Chapter 4-1 After you fall from the empty coffin
trap. It's in one of the treasure chests.
[ ] - Diamond (Trilliant) - Chapter 4-2 After putting all 3 Emblems in the
door. Shoot the shiny thing above the next door.
[ ] - Topaz (Brilliant) - Chapter 5-3 After you lower the drawbridge, shoot
the shiny thing above the door on the other side of the bridge.
[ ] - Ruby (Brilliant) - Chapter 5-3 Leave the room with the giant elevator.
It is the shiny thing on the ceiling in the hall on your way to the
drawbridge room.
[ ] - Sapphire (Brilliant) - Chapter 5-3 Wesker/Jill fight after Wesker kicks
you through the door, follow the corridor into the 2nd room full
of coffins. In the coffin that needs an assist to open.
[ ] - Emerald (Brilliant) - Chapter 5-3 Wesker/Jill fight. Run up the
staircase on the right and follow the path round to the right.
Break the pots at the end.
[ ] - Diamond (Brilliant) - Chapter 2-2 After the Irvine Scene, it is up the
mountain in a treasure box.

[ ] - Topaz (Marquis) - Chapter 1-1 - Kill the large wave of majini
that appear after you jump out the window. The last one
drops this.
[ ] - Ruby (Marquis) - Chapter 2-1 In the middle of the stands in
front of the house with the key on the dead body. Grenade
the stand on the right if you have your back facing the
houses.
[ ] - Sapphire (Marquis) - Chapter 5-3 At the start of the level
Go left at the fork in the path. Its in a safe.
[ ] - Emerald (Marquis) - Chapter 3-3 Second stop off the boat.
Between the two gun turrets in a drawer.
[ ] - Diamond (Marquis) - Chapter 6-3 Final fight with Wesker in
the volcano, after Wesker appears for the first time,
turn around and head towards the bridge that collapses.
Before stepping on it, shoot down the rock on the other
side that is the same colour. Now when you fall through
the bridge, turn to your left and jump over the rock to
pick up the diamond.

[ ] - Power Stone - Kill a Reaper (Giant Bug with shiny spots)
[ ] - Lion heart - Chapter 5-1 Kill a Licker Sometimes it's dropped.
[ ] - Blue Enigma - Chapter 3-1 Kill a Giant Manjini
[ ] - Soul gem - Chapter 4-1 End boss, must shoot under his tail.
[ ] - Heart of Africa - Chapter 5-3 Make Wesker Leave by damaging him enough during the end fight. It will be between the stairs.

Credit: AbsoluteSteve