Middle Earth: Shadow of Mordor is already available on PC and if you are getting any bugs while playing the game click HERE for quick solutions. Use the following method to get the Middle Earth: Shadow of Mordor Black Celebration Trophy / Achievement.
Completing the Middle Earth: Shadow of Mordor Black Celebration, Poison a Captain at his own Feast Trophy / Achievement will give you one Bronze Trophy or 15 GamerScore Points.
To get the Middle Earth: Shadow of Mordor Black Celebration Trophy / Achievement, you must unlock the Poison ability to poison the Captain. Get this ability by completing The Outcasts! Trophy / Achievement. Feasts will be marked in red on your map. If you cannot see any red marks indicating Feasts, then scroll over a Forge Tower on your map and advance the time. This will make new events spawn. Do this until a Feast appears.
After reaching the Feast, poison one of the drinking bowls using stealth, for the Captain to drink it and die. Try again if you are seen.
Follow this video guide if you are still unclear:
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