He kills the sea monster. It was sent by Poseidon to swallow Andromeda for a sacrifice to him. Perseus killed it and saved her by driving his sword in its mouth.
He also by accident killed Acrisius, his father-in-law.
Medusa
No, Perseus killed Medusa.
The Medusa was killed by Perseus
She did not kill anyone perseus killed her
I assume you mean Hercules/Heracles. Hercules didn't kill Medusa---Perseus did. Perseus killed Medusa by looking into a mirror to avoid Medusa's gaze and killed her.
No, they did not. The hero Perseus decapitated Medusa.
Medusa was mortal; and so Perseus could kill her.
What are the divine gifts Perseus receives as he sets out on his quest to kill Medusa
Because that was his "mission"
Perseus, and he succeeded.
Zeus gave Perseus a sword to kill Medusa.
kill medusa and the kraken