Rocket League
88 Achievements
1000 XP
20-25h
Natural Progression
Win an Online Match with Backfire, Scarab, or Zippy
15 XP
0.4%
How to unlock the Natural Progression achievement in Rocket League - Definitive Guide
RepeatForever
TrueTrophies
TrueTrophies
In the game, you are given weekly challenges, if you are lucky you will manage to collect one of these many cars in them. If you do, you just have to win one online match, it can be in either: Casual Duel, Casual Doubles, Casual Standard, Casual Chaos, Competitive Duel, Competitive Doubles, Competitive Standard, Rumble, Dropshot, Hoops, Snow Day, and possibly in online tournaments. An easy way also is to hit up your friend(s) and ask them if they can help you.
BeforeJam, DISCOKING, et, al
Head into any online match with Backfire, Scarab or Zippy, alone or with friends and win. If you're new to the game, you'll probably only have Backfire. It doesn't have to be ranked. If you're not that good, play a larger match so you can be hopefully carried by your team. After you win an online game, you'll get this. You'll get this if you win a game you join late but most of the late games I join I get put on the losing side. See this quote by cenorexia for a little trick you can use to speed this up:
If you are having a hard time winning an online match for Natural Progression (or simply want the trophy guaranteed and as quickly as possible) you can start a new private online match, set it to 1v1 with no bots and.. well, I guess you know what to do then 
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Quadro
stratege.ru
stratege.ru