You reach Asgard in the end where you have to fight Baldur on the Bifrost, after you and Atreus defeat Baldur, Thor shows up with Odin and one by one other Norse Gods show up. Odin reveals to Atreus his true nature and tells him that Kratos isn't his real father because Odin is to which Atreus calls Odin a liar only to find out that Odin is telling the truth. Atreus starts screaming at Kratos because he feels betrayed and Odin tells Atreus to join him and his son Thor where he really belongs and Kratos tells Atreus not to because he is still Atreus father and raised him and at this point Atreus is really pissed and has Lightning all around him revealing that he basically has similar powers to Thor. Game ends with Atreus Joining Odin and the other gods while Thor destroys the Bifrost that Kratos was standing on and the game ends with Kratos falling to Hel while we get a shot of Atreus standing in front of all the Gods while Odins hands are on Atreus shoulder with a evil smile and then you see Athena appear standing behind all the Gods revealing that she might be behind all of this.
Kratos wifes real name in the game is Frigga but she goes by Faye. She is Odins wife but left him because of his brutal ways.
Loki in the end credit scene is revealed to be the Witch of the Woods in disguise.
For a short period you get to fight Egyptian enemies. Kratos finds out that all the other Gods from other myths know about Kratos and The Egyptian Gods send their people to deal with Kratos with Kratos defeating them all and vowing to find the Egyptian God and promising to destroy him and his world.
There you go.
Now just wait for a lets play to see it come together.