Heroes of the Storm 2.0 - Nexus Challenge 2.0 (Quests & Rewards from April 25th to May 22th)

Probably most of you know that there's been an important update in Heroes of the Storm, there is already a thread on this forum about Heroes of the Storm 2.0 by Kennible here.  There you have info about how to get one of the five bundles with 20 Heroes for free. If you are already playing the game or came back for this update, probably already know about these challenges, but just in case here is a Summary.

If you already have an account, even if you aren't active, this might be a good chance to play a bit for the next weeks and get a lot of free stuff, just in case you ever want to play again.

Nexus Challenge 2.0

Starting with the launch of Heroes 2.0, and lasting until May 22, all players will receive the Nexus Challenge 2.0 quest chain.
Each quest will offer epic in-game rewards in both Heroes of the Storm and Overwatch to players who complete Heroes of the Storm games while partied with a friend!
A new quest will begin each week during the Nexus Challenge 2.0 event.
    Only one Nexus Challenge 2.0 quest will activate in players’ Quest Logs at any given time.
    Subsequent quests will not appear until their start dates have passed, and all of the player’s previous Nexus Challenge 2.0 quests have been completed.
    For example: Players who wait until the final day of the event to begin their Nexus Challenge 2.0 quests (not recommended!) can still complete all four quests, but must do so one at a time.
Learn about each quest below, check out our Nexus Challenge 2.0 page for more details, and be sure to complete your quests before May 22, 2017.
    Quest 1: Starts after April 25
        Complete 5 games with a friend in Versus A.I., Quick Match, Unranked, or Ranked.
        Overwatch Rewards: Oni Genji Skin, Portrait, and Spray.
        Heroes Rewards: Orochi Hovercycle Mount, Oni Genji Banner, Portrait, and Spray.
    Quest 2: Starts after May 2
        Complete 5 more games with a friend in Quick Match, Unranked, or Ranked.
        Overwatch Rewards: Officer D.Va Skin.
        Heroes Rewards: Busan Police Hovercycle Mount.
    Quest 3: Starts after May 9
        Complete 5 more games with a friend in Quick Match, Unranked, or Ranked.
        Overwatch Rewards: Officer D.Va Portrait and Spray.
        Heroes Rewards: Overwatch Nexagon Mount, Officer D.Va Banner, Portrait, and Spray.
    Quest 4: Starts after May 16
        Complete 5 more games with a friend in Quick Match, Unranked, or Ranked.
        Overwatch Rewards: 10 Loot Boxes.
        Heroes Rewards: 10 Loot Chests (one of which is Rare).