Override: Mech City Brawl

Here's how to get all achievements requiring you to unlock skins or accessories.

takes at most 25400 Gold
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takes at most 18000 Gold (only the first 12 mechs count)
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takes at most 15800 Gold
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Following this guide will also get you:
and most likely
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That means you need Gold, a lot of it. So keep these cheevos for last.
Once you've grinded your 50 online wins and 500 Xenotype kills (takes about 2 campaign playthroughs) and done the other misc achievements, the real grind begins. You've surely noticed that you unlock one skin or accessory for every completed match. If you already own it, you get money as compensation.

Active grinding method (2 controllers):
Select Versus Mode, use a 2nd controller, go to match settings (), select Free For All mode, Health Multiplier 0.5.
Select any characters and fight. Using RT is probably the quickest way to defeat the other mech. Once the match has ended, you can immediately initiate a rematch.
Takes about 40 seconds per match (loading included).

Semi-active grinding method (1 controller):
Select Versus Mode, go to match settings (), select Teams mode, Health Multiplier 0.5, Time Limit 1 Minute.
Select any character for yourself, then add three bots. You want it to be a 1 vs. 3 match, so change the bots' team and their difficulty to hardest. Start the match and let them finish you. Hit rematch once you're down.
Also takes about 40 seconds seconds per match (loading included).

Check your earned money and unlocked skins/accessories every now and then and keep track how much gold you need for the most time consuming of these achievements (probably the unlocking all accessories one). This is obviously unique for everyone since the drops are random. Once you have accumulated enough gold to unlock said achievement, the real trick begins.

Save game trick:
1) You need your game to be saved to the cloud. To make sure that happens, close the game after you have the required amount of gold. Wait 20 min or so to be safe.
2) Start up the game, go to the garage, choose one of the achievements above to unlock by fulfilling its requirement. The achievement will not pop, but don't worry. Back out of the Garage. Back on the main menu, press Pick Profile. Press A to start the game and select your profile. The achievement will pop!
3) Hit the dashboard () highlight "Override" and press but don't quit out of the game!
Select "Manage game & add-ons", go down to "Saved data", go to your save game and press A on it. Select "Delete from console".
4) Start up Override again. Select your profile, the game will now get the save game from the cloud. Go to the Garage and congratulations, you will still have the same amount of gold.
Repeat from step 2) to get the other achievements.

Fastest way to earn money!

Credit goes to ryuji_sakujo on PSNprofiles for this technique. It works the same on both PlayStation and Xbox. 15 second matches. A video is in the link below.
Basic steps - play a splitscreen verses match, both controllers signed into a profile.
Once the match starts, press the Xbox/home button on the second controller- go over to profile and then ‘sign out’ - this will give the win to the profile on the first controller you are grinding money/achievements for. The match end screen comes up and simply accept to play a rematch. The following rematches will instantly give you the win seeing as only one player is present. Do this for however long you like.

https://forum.psnprofiles.com/topic/93133-video-how-to-farm-...