Here is the full list of all 99 Fighter Within achievements worth 1,000 gamerscore.
Complete the first Chapter of Initiation mode
Complete the second Chapter of Initiation mode
Complete the third Chapter of Initiation mode
Complete the fourth Chapter of Initiation mode
Complete the fifth Chapter of Initiation mode
Complete Arcade mode with Matt
Complete Arcade mode with DJ João
Complete Arcade mode with Vince
Complete Arcade mode with Maze
Complete Arcade mode with Loa
Complete Arcade mode with Færgas
Complete Arcade mode with Chayan
Complete Arcade mode with J-Gun
Complete Arcade mode with Sabina
Complete Arcade mode with Vân
Complete Arcade mode with Mia
Complete Arcade mode with Yu Bei
Complete Arcade mode with every character
Win 20 fights in Solo mode
Win 50 fights in Solo mode
Win 30 fights in local multiplayer mode
Win 300 fights in local multiplayer mode
Win 10 fights in Solo mode by KO
Win 50 fights in Solo mode by KO
Win 300 fights in Solo mode by KO
Win 10 fights in Solo mode by Ring Out
Win 50 fights in Solo mode by Ring Out
Win 300 fights in Solo mode by Ring Out
Win a match in each arena in Solo mode
Win a match with each fighter in Solo mode
Become a yellow belt
Become an orange belt
Become a green belt
Become a blue belt
Become a brown belt
Become a black belt
Become a black belt 2nd dan
Become a black belt 3rd dan
Become a black belt 4th dan
Become a black belt 5th dan
Become a white and red 6th dan belt
Become a white and red 7th dan belt
Become a white and red 8th dan belt
Become a red belt 9th dan
Become a red belt 10th dan
Perform 10 Combos
Perform 100 Combos
Perform 1000 Combos
Perform 5 Auto Counters
Perform 50 Auto Counters
Perform 500 Auto Counters
Perform 5 Throws
Perform 50 Throws
Perform 500 Throws
Perform a Counter
Perform 10 Counters
Perform 100 Counters
Perform 10 attacks with the first Ki Cell
Perform 300 attacks with the first Ki Cell
Perform 1000 attacks with the first Ki Cell
Perform 10 Ki Short Range Swaps
Perform 100 Ki Short Range Swaps
Perform 500 Ki Short Range Swaps
Perform 10 Ki Short Range Slams
Perform 100 Ki Short Range Slams
Perform 500 Ki Short Range Slams
Perform 10 Ki Long Range Attacks
Perform 100 Ki Long Range Attacks
Perform 500 Ki Long Range Attacks
Perform 10 Ki Long Range Swaps
Perform 100 Ki Long Range Swaps
Perform 500 Ki Long Range Swaps
Perform 10 Ki Long Range Slams
Perform 100 Ki Long Range Slams
Perform 500 Ki Long Range Slams
Use a Pole
Use a Pole 10 times
Use a Pole 100 times
Use a stick
Use a stick 10 times
Use a stick 100 times
Perform 1 close combat attack on pole (Combo / Counter / Auto Counter / Throw)
Perform 10 close combat attacks on pole (Combo / Counter / Auto Counter / Throw)
Perform 1 special Ki attack on pole (Back Move / Front Move / Swap / Slam)
Perform 10 special Ki attack on pole (Back Move / Front Move / Swap / Slam)
Perform 10 finishing moves
Perform 50 finishing moves
Win by KO against a yellow belt opponent in less than 30 seconds
Win by KO against an orange belt opponent in less than 20 seconds
Ring Out a green belt opponent in less than 30 seconds
Ring Out a blue belt opponent in less than 20 seconds
Defeat a blue belt opponent performing only Counters
Win a match thanks to a slam against a black belt opponent
Ring out a yellow belt opponent with 10% left on your life bar
Ring out a black belt opponent with a stick
Win 3 matches in a row against a yellow belt opponent
Win 10 matches in a row against an orange belt opponent
Win 20 matches in a row against a green belt opponent
Defeat a red belt 10th dan opponent