| "I once thought I could save the world... now look at it"
— Spoilers for Deus Ex: Mankind Divided follow!
He's [Not] Dead, Jim is a secret achievement/trophy in Deus Ex: Mankind Divided. It is awarded for saving the life of Jim Miller using the antidote that can be obtained during the mission M12: The Heist.
After the main mission Facing the Enigma, you will be given the choice between saving the life of Allison Stanek, or breaking into VersaLife's Palisade vault. To get this achievement, you must choose the mission to access the vault, called The Heist. Once you have gained access to VersaLife's corporate vault, open the safe directly in front of you when you walk in either through hacking, or by using a multi-tool. Inside the safe there will be a vial labelled "Orchid Neutralizing Enzyme". Pick up this vial, and it will remain in your inventory as a story item until the final mission.
In Apex Centre, London, Jim Miller is forced to drink champagne that is poisoned with an experimental gene-altering chemical called the Orchid. The Orchid Neutralizing Enzyme you got from the VersaLife vault is the only way to cure its effects. Interact with Miller until the dialogue option appears to give him the antidote, thus saving his life and awarding you the achievement.
- The title of the achievement is a reference to the line "He's dead, Jim" frequently said by the character Leonard McCoy in the original series of Star Trek.