- Campaign runs
- Two, unless the first is on Insane: chapter select cleans up what you miss.
- Difficulty
- Insane for three: Today We Are Canceling the Apocalypse, For Whom The Bell Tolls, Dead Serious.
- Co-op
- You're My Brother: every act in co-op.
- Online
- All of Horde Siege and Versus, which needs a Game Pass tier with online multiplayer.
- Longest
- 25,000 Versus kills, 50,000 Horde Siege kills, four classes at max level, four Re-Ups.
- Missable
- Nothing for good, by the guides we read: chapter select replays any section.
The route
Step 1 — A first campaign, picking up everything
Play on Normal or Hardcore. Accept every secondary objective, open every Hard Case, and listen for collectibles; the thirteen story achievements come on their own. Do the campaign one-offs on the way — the setups are below. If a friend is playing, make this the co-op run for You're My Brother.
Step 2 — Clean up with chapter select
Check the War Journal for missing collectibles and replay those chapters, along with any missed Hard Case or secondary objective. That finishes Side Piece, Relax. I'm the Map., Memories From E-Day and Quartermaster, and Remember Kalona is already done.
Step 3 — Insane
Every act on Insane for Today We Are Canceling the Apocalypse and, with the 100% from step 2, For Whom The Bell Tolls. Do not touch the gameplay settings that move you off the Insane tier.
Step 4 — Horde Siege
Start as Medic, so the 250 Stim Vaporizer revives build early, then level the other three classes for Siege Specialist. Lift Outta Hell, the Invasion Events, the Energy spent and the 100 side objectives come with time. Save Never Fight Alone for a squad you know, on Allfather.
Step 5 — Versus and Player Level, in the background
25,000 Versus kills is the slowest counter on the list, and every kill counts whatever the result. Fit in a Conquest shutout, a Demolition detonation and the Battleship one. Four Re-Ups end with Got Your Wings; Dead Serious comes last, then The Lucky Ones Died on E-Day on Steam.
The two big Insane achievements, word for word
| Achievement | Official text | What that means |
|---|---|---|
| For Whom The Bell Tolls (75G) | Complete Campaign on Insane, complete all side missions, find all hidden items. | One guide's copy of the list says the 100% can be on any difficulty; the official text does not say. An Insane run plus a cleanup on a lower setting is the reading the guides plan around. |
| Dead Serious (85G) | 100% Campaign on Insane, 25,000 kills in Versus, max Player Level, and max 4 classes. | Read literally, the 100% is on Insane too. No guide we read has tested whether a lower-difficulty cleanup counts. |
Setups for the campaign one-offs
Horde Siege, class by class
| Class | Equipment | Achievement |
|---|---|---|
| Assault | Sonic Disruptor | Turn It Up to 11 — execute 50 enemies it stunned |
| Breacher | Adrenaline Injector | I'm All Amped Up — 30 seconds of Adrenaline |
| Marksman | Pulse Drone | Spotted and Slotted — pulse 1,000 enemies |
| Medic | Stim Vaporizer | Down, but Not Dead — 250 revives from DBNO |