The following achievements are available with the bonus downloadable Flashback and Combustible Map Packs:
| Achievement | How to unlock |
| Annex: Now With Execution Rules (75 points) | Win an Annex match on each Flashback and Combustible Map Pack map (public matches only).
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| Bound by a Shared Past (15 points) | Win a Wingman match on each of the 5 Flashback Map Pack maps.
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| Forged in the Fire (15 points) | Win a Wingman match on each of the 3 Combustible Map Pack maps.
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| More Mystery, Less History (15 points) | Win a multiplayer match on each of the 5 Flashback Map Pack maps (any mode except Wingman).
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| Skeletons in your Closet (20 points) | Complete waves 1 through 10 on all Flashback Map Pack maps in Horde (any difficulty).
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| The Roof! The Roof! The Roof... (15 points) | Win a multiplayer match on each of the 3 Combustible Map Pack maps (any mode except Wingman).
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| Trial by, and on, Fire (20 points) | Survive first 10 Horde waves on Combustible Map Pack maps as a team.
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