Here is the full list of all 49 GUTS achievements.
Win a match with no limbs left
Use a Hazard to dismember a rival
Fall into a hazard by yourself
Block 3 GUTS Moves in one Match
Apply your first successful GUTS move
Win a match without being dismembered
Launch all 12 GUTS Moves available for all Season 50 Characters (Total: 108)
Heal a limb
Dodge a GUTS move using the Dodge U-Move 3 times
Fill your GUTS Bar using the Fill U-Move 10 times
Use object in the scenario 10 times with the Throw Object U-Move
Reach Popularity Level 10
Reach Popularity Level 5
People That Don't know U Love U
Combo regular moves into a GUTS Move that sends your rival into a hazard
Get a 10-Hit Combo
Beat the game in Hardcore Mode
Beat all characters on JB Judge Endurance Match in your first try on that story run
Make a comeback while having no limbs and your rival still with all limbs
Get all hazards covered in blood at The Last Resort
Get your rival to be severed by the roller coaster and the boat in the same match at The GUTS Park
Have your rival losing a limb to Lawrence Blaze's Hat at VIP Gig stage
In a single match, get a player to lose limbs being run over, in a electric ball and in the Crimson display
Play 5 matches on Classic Mode
Play in all 16 stances of one character (any character)
Spend 5 minutes practicing on Training Mode
Check out 10 items you Unlocked on the Extras menu
Complete a Casual and a Ranked Online Match
Win 15 Online Matches (Casual or Ranked)
Start a combo with a non-full GUTS Bar, use GUTS Fill and deliver a GUTS Move without losing the combo counter
Dodge a GUTS Move and connect your GUTS move right away
Finish Jack Slumber's story and view the Regular Ending
Finish Shao Dong's story and view the Regular Ending
Finish Father Maromba's story and view the Regular Ending
Finish Svet Kanyvel's story and view the Regular Ending
Finish Miranda Hut's story and view the Regular Ending
Finish Risa Akabane's story and view the Regular Ending
Finish Sergeant Sam's story and view the Regular Ending
Beat the Story Hardcore Mode... If you can....
Complete any character's True Ending
Finish Anita Vanilla story and view the Regular Ending
Finish D.B. Judge's story and view the Regular Ending
Complete all 9 GUTS Character Stories' regular endings
Complete all 9 GUTS Character Stories' true endings
Finish a 1-Hit Dismember match
Finish a Full Chaos match
Successfully throw a Limb and connect it on an adversary
Finish GUTS beginner tutorial
Finish GUTS advanced tutorial