Search the indicated locations to find all 50 ID Tags. Collect all 50 ID Tags to get "The Taken" achievement. You can view which ID Tags you have collected under the map menu. Each ID Tag has its own name, which allows you to easily keep track of which ones are missing. The ID Tags are saved automatically when you collect them up. Thus, you do not need to collect them again if you die. Use the mission selection to obtain any missed collectibles.