|Complete all levels on a 'Classic' difficulty.|
Classic is a health system rather than a specific difficulty, and it means that you will not regenerate health once you have taken any damage, so you will need to find armor and health packs during the missions to recover any health. Once you have chosen the Classic health system, you will then choose your game difficulty, and it is recommended that you choose the easiest difficulty, Operative, to make this achievement as easy as possible.
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