Back in 3e this was easier: you need to cover all the cleric domains. 5e's much shorter list of domains makes this less fun, in my opinion.
On the other hand, my favorite fantasy pantheon is Guild Wars' true gods, which has only five. Balthazar, god of war, fire and smiths; Dwayna, goddess of air, life, and magic (and nobility); Grenth, god of death and justice; Lyssa, goddess of truth, beauty, and illusions, and Melandru, goddess of earth and nature. It's pretty easy to cover most fantasy archetypes with this list. (aside from racial deities and evil powers.)