Jonathan Haidt (The Righteous Mind) says that there are six:
1-care (harm) evolved from the need to care for infants and is triggered by sympathy or compassion at signs of suffering.
2-fairness (cheating) evolved from the need to repay friendship or detect cheating and is triggered by anger at cheats or warmth toward friends.
3-loyalty (betrayal) evolved from need to stick together against rival groups and is triggered by hatred to traitors and respect for team players.
4-authority (subversion) evolved from need to defer to older siblings, parents, and elders and is triggered by signs of respect or disrespect.
5-sanctity (degradation) evolved from need to avoid infectious or poisonous things and is triggered by feelings of disgust.
6-liberty (oppression) evolved from the need to prevent being dominated and is triggered by signs of dominance.
My question: this seems reasonable, but are we sure that there are only six? Might there be more which correspond to other evolutionary adaptations and evolved emotions? I am inclined to think so.