Investigations are DCUO collectibles similar to Collections and Briefings. Investigations' tokens are marked with a green exclamation mark (!). When players complete a Briefing, they receive a piece of armor or an accessory.
DCUO Bloguide currently has 58 investigations, which are listed below:
| Investigation | Zone | Location |
|---|---|---|
| Against the HIVE | Metropolis Duos |
Little Bohemia HIVE Base |
| Amulets of Memory | Metropolis | Downtown |
| Arkham Session Notes | Gotham | Arkham Island |
| Artifacts of Themyscira | Instance Instance Challenge |
Chinatown Electronics Circe's Stronghold Circe's Stronghold |
| Azarathian Sin Gems | Metropolis | Midtown |
| Barry Allen’s Case Notes | Duos | Flashback |
| Behind the Wall | Alerts | Stryker's Island |
| Cadmus Research Findings | Alerts | Area 51 |
| Chronicles of Death | Alerts | League of Assassins |
| Concentrated Chemical Samples | Alerts | Bludhaven |
| Confiscated Arcanum | Metropolis | Chinatown |
| Crystalline Soul Fragments | Metropolis | Chinatown |
| Darkseid’s First Born | New Genesis Alert |
New Genesis Fatal Exams |
| Dr. Arkham’s Observation Journal | Alerts | Arkham Asylum |
| Enigmatic Puzzles | Gotham | Otisburg |
| Eternal Solitude | Raids | Fortress of Solitude: The Chasm |
| Falcone’s Finest | Gotham | Burnley |
| Ferris Reels | Alerts | Coast City |
| From the War Front | Gotham Under Siege | Gotham Under Siege |
| Frozen Heart | Gotham | Burnley |
| Ghost in the Machine | Gotham Duos |
Otisburg OMAC Base |
| Glimpse of the Fourth World | Raids Raids Raids Alerts Alerts |
League Hall: Lockdown Necropolis: Relics of Urgrund Artifacts from the Past League Hall: Security Breach Intergang Crime Wave |
| Gorilla Bomb Components | Metropolis | Little Bohemia |
| Gorillatech Schematics | Metropolis | Downtown |
| Gotham Gone to Hell | Gotham Wastelands | Gotham Wastelands |
| Hope for the Hopeless | Raid Hero Command Center Villain Command Center Downtown Metropolis Battlezone |
Assault & Battery Mogo's Command Center Ranx's Command Center Downtown Metropolis Battlezone |
| Imps Are Imp-ortant! | Duos | Wastelands Wonderland |
| Leave of Absence | Raids Raids Raids |
Labyrinth of Lost Souls Halls of Hades Throne of the Dead |
| LexCorp Genome Database | Metropolis | Little Bohemia |
| Lunar Exobyte Clusters | Alerts | Hive Moon Base |
| Lunar Silver | Metropolis | Midtown |
| Luthor’s Orders | Downtown Metropolis Battlezone Alert Alert |
Downtown Metropolis Battlezone Avarice Impurity Rage Impurity |
| Meet the New Gods | Raids Alerts Raids Raids Alerts |
Artifacts from the Past League Hall: Security Breach Necropolis: Relics of Urgrund League Hall: Lockdown Intergang Crime Wave |
| No Man Escapes | Metropolis Alerts |
Historic District Metropolis City Hall |
| Oaths of Light | Metropolis | Downtown |
| Paradise Island | Alert Command Post Challenges Challenges Duos |
Themyscira: Divided Themyscira: Command Post Circe's Trial Aegis of Truth Supply Line |
| Pernicious Pictures | Gotham Challenges |
East End The Joker's Funhouse |
| Ritual Canopic Jars | Gotham Instance Duos |
Burnley University Warehouse Gotham University |
| Rose By Any Other Name | Gotham | Burnley |
| S.T.A.R. Labs Mist Project | Downtown Metropolis Battlezone Alert |
Downtown Metropolis Battlezone Mist Recovery |
| Shards of Memory | Raids | Fortress of Solitude: Power Core |
| Signs of the Beast | Metropolis Instance |
Tomorrow District Metro Station Building |
| Simalien Technology | Alerts | Gorilla Island |
| Steelworks Robot Protocols | Metropolis | Suicide Slums |
| The Atlantis Chronicles | Metropolis | Suicide Slums |
| The Battle for the Armory | Alert | Hall of Doom Armory |
| The Color of Danger | Alerts | Star Labs |
| The Doctor Is In | Metropolis Challenge |
Little Bohemia Meta Research Wing |
| The Files of T.O. Morrow | Alerts | Ace Chemicals |
| The Flame of Change Codex | Raids | Gates of Tartarus |
| The Island of Dr. Morrow | Alerts | Oolong Island |
| The Precipice of Fear | Gotham | East End |
| The Voice of Doom | Alerts | Smallville |
| Tools of the Trade | Raids Raids / Alert Raids |
The Outer Cavern The Inner Sanctum Brainiac Sub-Construct |
| Trigon Tainted Artifacts | Metropolis Challenges |
Tomorrow District 8th Precinct |
| Twisting the Titans | Gotham | Robinson Park |
| Viva la Lucha Libre | Gotham Instance Duos |
East End Distribution Center Cape Carmine Lighthouse |
| World War III Remnants | Raids | Kahndaq |