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Use First Aid any time you’re injured and have sufficient Medi-gel and you’ll unlock the related achievement before long.

Use the First Aid ability 50 times to unlock this achievement. To use First Aid, you must possess at least one unit of Medi-gel, and a character in your squad must have taken some health damage. Just use this ability any time you have max Medi-gel (enemies will drop this often enough) whenever you take damage and you’ll get this achievement before long.