Xenophobia

Xenophobia is an achievement in Halo: The Master Chief Collection. This achievement is obtained by completing any Halo 3: ODST level without using Covenant weapons.

Strategy

 * Uplift Reserve is the recommended level to earn this achievement. Simply use a Warthog and drive all the way to finish the level.
 * The ability does not forbid the player from picking up Covenant weapons (as long as they don’t fire them), nor giving them to NPC teammates who then use them.