Play Paladins on Steam.

Obtainable in the Refer-A-Friend[www.paladins.com] program.
You will get this skin and the weapon that it comes with it, when you will play 10 hours with the refered friend in a party.
Since they recently modified the conditions to get the weapon to the same one as the skin, in theory, you should get both skins in a bundle, after completing the said conditions.
If you still didn`t got it yet, contact Hi-Rez support[www.hirezstudios.com].

Note:
You can add us as refferers.
IGN: ClueBoddy.
Refer Program doesn`t work if your account is older than a week or if your level
is above 5.

VERY IMPORTANT
Only the referer gets the skin. Not the one who got the invitation from referer (not the newbie).
The Referee can still get lots of gold and if they both play togheder, 400 crystals in total.

Source (wallpaper): Pip Wallpaper - Julia CS[www.deviantart.com]

Go here[www.hirezstudios.com]
Note: You can get this skin, only if you have and open your xBox console.

Go here[www.hirezstudios.com]
Note that in order to get this skin, you must copy your PC account over PSN one and confirm that on your physical PS4.

Link your Hi-Rez account with Twitch, here[www.hirezstudios.com] to get this skin, along with the Ying champion.

Known possible sources of giveaways if you want to check. I check Reddit thread often although I admit I don't check Twitter often. If you see anything, be sure to let me know!

Reddit Thread
Paladins Codes Twitter
Paladin Code Twitter
Paladins Codes - Connectiva Systems[www.connectivasystems.com]

24.04.2023
Removed Bounty Store.

10.10.2022
Minor fixes to the "News" section of the guide.

27.07.2022
Removed the temporary Night Bane Skin for Cassie Alienwarearena giveaway.

25.07.2022
Fixed a problem where TF2 Barik picture stopped appearing in the guide.
Added a temporary giveaway: Nightbane Cassie (Alienwarearena).

14.02.2022
Removed Onyx Stallion skin from the guide.
No longer available.

14.10.2021
Fixed the broken link in the Bounty Store section.
Now it should properly redirect to the linked accounts section.

??.09.2021
Added a 'Temporary Giveaways' section to the guide.

14.08.2021
Removed Victor Charcoal, Viktor Matte and Jenos Resplendent skins.
Removed the YouTube preview from the Bounty Store section since the Bounty Store video was removed by Hi-Rez.
Added a "News" section in the guide, about various skins and their removal from the game.

30.07.2021
Removed Maeve and Lex Strike skins.
Apparently the Strike Paladins game on mobile is taken down so these skins can't be obtained for free anymore. Lex Strike skin might be in a bundle.
Changed the description on how to get Onyx Stallion, Viktor Charcoal and Matte skins.

10.11.2020
Added Bounty Store section.
Added "Paladin Codes" from Connectiva Systems website article.
Updated the way you can obtain the Team Fortress 2 Barik skin from "Win/Play 5 matches on Steam with Barik" to "Play Paladins on Steam".
Changed the picture at certain skins.

17.05.2020
Removed Bloodmoon Cassie, Quicksilver Ying and Dreamhack Maeve skins.

18.03.2020
Removed Coldsnap Furia Skin and Convention 2017 Ying Skin

10.11.2018
Added Coldsnap Furia Skin.
Updated the info on Dreamhack Maeve skin.
Minor changes to guide.

24.10.2018
Added Convert Ops Lex Skin.
Changed the name from "Stage 4" to "PS4" (Androxus) in order to be easy identifiable the origin of the skin.

30.09.2018
Added important note about Twitch Prime Rewards.

06.09.2018
Updated the outdated info on Androxus xBox skin.

29.05.2018
Removed Pip`s Mad Scientist Discombobulator skin.

15.05.2018
Removed Volcanic Makoa skin.

28.04.2018
Added Maeve Strike skin. Updated the pictures for X and Stage 4 Androxus Skins.

20.04.2018
Removed all the Season 1 ranked rewards.

26.11.2017
Added Ying Convention 2017 and Resplendent Jenos Skins.
Changed the picture at certain skins.

05.09.2017
Added exact steps on how to get X Androxus Skin if the "Platformlevel and Accountlevel cannot be both 0" error. Added exact link so players can get the Ying Twitch Weapon Skin.

31.08.2017
Added Ranked rewards. Added Mad Scientist weapon. Minor changes to guide.

26.08.2017
Added Twitch skin drops. Minor changes to guide.

1.08.2017
Added X & Stage 4 Androxus and Volcanic Makoa Skins.

1/6/17 - Added Ying Twitch Illusory Weapon.
11/17/16 - Added Cuddly Makoa Skin.
11/15/16 - Removed old giveaways. Also lately I have been noticing more of give aways via gleam thing but the problem they usually time limited.
11/8/16 - Removed Buck Command Body skin giveaway.
11/3/16 - Removed Halloween giveaway.

As of 31 May 2018, Paladins Twitch Prime Rewards are gone!!!
Source:
Last Chance to Claim the Twitch Prime Bundle!

Mixer was shut down on 22 July 2020 by Microsoft therefore, the Mixer Store (Viewer Store) in Paladins was shut down as well.
As Mixer is now shut down, there is no current way to obtain the Mixer skins, unless, of course they will be introduced in the game through other way.
Sources:
Paladins Wiki - Viewer Store[paladins.gamepedia.com]
Mixer (service) - Wikipedia[/url

July 2021

The [url]Paladins Strike website[en.wikipedia.org] as well as the Paladins Strike game page on Google Play Store and iOS were taken down.
Therefore, I had to remove the Strike skins from this guide.

On the link account page, the option to link your Twitter to Hi-Rez is vanished.
For Facebook, the icon is still there but the option is deactivated.
Therefore, I had to remove several skins from the guide, namely Victor Charcoal, Viktor Matte and Jenos Resplendent skins.

The "Paladins Community" page is no longer available therefore you can't get the Onyx Stallion, Viktor Charcoal and Viktor Matte skins anymore.

Starting in Season 6, the Bounty Store will no longer be available for purchases, the Bounty Marketplace will be shut down, and all Bounty Coin transactions will cease.

Source:
https://www.paladins.com/news/bounty-store-marketplace-sunset-faq

Here I will list any temporary skins giveaways, if I ever come across them.

The current giveaway is:

None.