“Are you ready to dominate the tracks in MX vs. ATV Supercross Encore? Look no further! This guide will show you how to get all 100% achievements and even provide a save file fix for the frustrating “1st in all tracks” glitch. Let’s rev up those engines!”
Ready…
of which online: 5
Glitched: 1 (Greatest of All Time – Place 1st in all tracks in career)
(will explain below)
Overall difficulty: 2 out of 5
Glitched – Greatest of All Time: Place 1st in all tracks in career
Greatest of All TimePlace 1st in all tracks in career
This achievement unlocks only in the career mode. It will get glitched if:
1) at some point you played single player mode,
2) you jumped into online racing.
Either obtain before multiplayer trophies or earn it on a clean save file after.
OR.
Use my save file and win the last race in 450 Championship. 
Download link: https://drive.google.com/file/d/16Azw0Hy7ncwWVSE5vSOojcNqmfYE8UGZ/view?usp=sharing
Location: a single file goes to C:\Program Files (x86)\Steam\userdata\user_name\282050\remote
Onlines-s-s
Step Into the ArenaComplete an Online Playlist match
Place 1st in 25 Online Playlist matches
Complete 25 Online Playlist matches
Finish 50 races online
Place 1st in an Online Playlist match with 11 human opponents
You have 11 players right? 😅
Championships-s-s
250 WestPlace 3rd or higher in the 250 West Career
Place 3rd or higher in the 250 East Career
Place 3rd or higher in the 450 Championship Career
Place 3rd or higher in the ATV West Career
Place 3rd or higher in the ATV East Career
Place 3rd or higher in the MX vs ATV East Career
Place 3rd or higher in the MX vs ATV West Career
Place 3rd or higher in the MX vs ATV Championship Career
Place 3rd or higher in the ATV Championship Career
Stunts, Tricks and Wins
You are LegendPlace 1st in any Race on All Time difficulty
Just play a way point mode, you’ll be 10sec+ ahead of AI, it’s very simple
Perform any airborne trick and land successfully
(hold CTRL and use ↑ ↓ → ← to perform a trick, obviously land safely)
Pull off 100 stunts
Land a backflip
(hold CTRL and ↓ and don’t crash on a landing)
Pull a wheelie over 150 feet
Pull a stoppie over 25 feet
Pull off three unique stunts in a Race Event
(There’s a list of stunts in the main menu, check it out!)
Equip an upgrade part
(Upgrades achieved after career races completion. Head to vehicle customization and install a better part)
Finish a race without going off track
(Drive slower and you’re golden!)
Lap an Opponent in a Race
Wreck 50 times
(probably will come naturally)
Ride for over 100 miles in Free Ride
(Unlocks after a ride, not during)
Win 10 Holeshots
When a race starts, hold you gas and brakes, then when a barrier is lowered, release brakes and reach the white arch first. You’ll know you’re first if you see that notification at the bottom left:
And that wraps up our share on MX vs. ATV Supercross Encore: MX vs. ATV Supercross Encore: Getting 100% Achievements + Save File for Glitched “1st in all tracks”. If you have any additional insights or tips to contribute, don’t hesitate to drop a comment below. For a more in-depth read, you can refer to the original article here by Lord Of War, who deserves all the credit. Happy gaming!