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The Twelve Labours of Hercules.
Hercules
Hera originally gave Hercules 10 tasks. But 2 of them she didn't count because he had help. This is why Hercules had to do 12 tasks.
Orion was one and Hercules is one she respected because he released her sacred deer after he finished his task (one of his Ten Tasks)
Apollo
Hercules was given 12 labors to perform in total. The original number was ten, but King Eurystheus added two more because he thought two of the original ten didn't count: Hercules received the help of his nephew Iolaus in slaying the Hydra, and received payment for cleaning the Augean stables/ the rivers her diverted into the stables did all the cleaning for him.
Comes from Hercules. Hercules was a greek who killed his wife and children so had to take upon 12 tasks called the labours of hercules.
He finished the tasks even though Eurystheus thought he couldn't.
Odysseus did not have specifically have 12 tasks, set apart from the rest. You are probably thinking of Hercules.
Yes
A "herculean" task (after Hercules' 12 labors).
After completing the ten labors, Hercules was initially denied the rewards he expected, as King Eurystheus, who had assigned the tasks, added two more labors to his list. Hercules then faced the challenges of capturing the Ceryneian Hind and the Erymanthian Boar. Eventually, after completing all twelve labors, he gained fame and recognition, but he continued to face numerous trials and adventures throughout his life, ultimately leading to his ascension to Olympus and immortality.