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This is the first and easiest achievement to win in HyperRogue.
From starting the game, on the main menu, select "HyperRogue Classic" to start a new game.
You will be placed in the "Icy Land", which has blue tiles and walls. Scattered around the Icy Land, you will see small, white crystals. These are called "Ice Diamonds", one of the many treasures to be found in HyperRogue. Simply click on a tile to move in that direction, and walk onto one of the white crystals to collect it and earn this achievement.

Note: Do not leave the Icy Land if you wish to earn this! If you see any differently-coloured areas around you, avoid them to remain in the blue Icy Land. If the music changes then you are in the wrong place! Either go back or start a new game to return.