Driven mad by Hera, Herakles slew his wife Megara and their children. After recovering his sanity, he traveled to the Sanctuary of Delphi to inquire how he could atone for his actions; he was instructed by the Pythia to go to Tiryns and serve his cousin, King Eurystheus, for twelve years. Therefore, Eurystheus set twelve tasks for Herakles. 
List of the labours
- Slay the Nemean Lion
- Slay the Lernaean Hydra
- Capture the Hind of Keryneia
- Capture the Erymanthian Boar
- Clean the Stable of Augeias
- Slay the Stymphalian birds
- Capture the Kretan Bull
- Steal the mares of Diomedes
- Obtain the girdle of Hippolyta
- Obtain the cattle of Geryon
- Steal the apples of Hesperides
- Subdue and take back Cerberus from the underworld.
- The actual metopes of the Temple of Zeus in Olympia which depict seven of Herakles' labours are faithfully recreated in Assassin's Creed: Odyssey. However, they can also be found inaccurately decorating temples in numerous places and even on the Parthenon.
- While unconnected to his atonement there is an event jokingly and informally referred to as the Thirteenth Labor where Herakles impregnated the fifty daughters of Thespius, king of Thespiae, in a single night. Many dynastic lines trace their lineage back to this event, including the Agiads and Eurypontids of Sparta, and the Argeads of Makedonia.