The Xbox 360 Achievements for Halo 3: ODST’s Firefight mode are not included in Halo: The Master Chief Collection.
While not containing Xbox 360 Achievements, players can play challenging survival scenarios that offer many opportunities for strategic teamwork and replay ability. Weekly and monthly challenges reward players for completing specific objectives.
If you would like to provide feedback about Halo 3: ODST, visit the Halo Discord server. This is the best place to share ideas for what you want to see changed, improved, or done differently.