Here is the full list of all 52 Jerez's Arena achievements.
Claudia completed her 20th Prostitution Quest
Claudia completed her 30th Conditioning
Bad End
True End
Ellin End
Ellin completed her 20th Prostitution Quest
Watched Ellin dance
Claudia End
Claudia completed her 20th Mercenary Commission
Ellin completed her 20th Mercenary Commission
Fed the birds with Claudia
"Lewdness" reached 200!
Ellin completed her 30th Conditioning
Defeated Isekai Adventurer Lica in Conqueror Mode.
Defeated Glenn at the height of his power in Conqueror Mode.
Reach any Ending
Win Ellin's third battle
Accumulate 100000 G worth of wealth
"Kinkiness" reached 200!
Ellin completed her 30th Training
Win Claudia's third battle
"Seduction" reached 200!
"Technique" reached 200!
"Obedience" reached 200!
Win Ellin's second battle
"Agility" reached 200!
"Dexterity" reached 200!
"Strength" reached 200!
Completed Claudia's Oiran Request
"Stamina" reached 200!
Punished Ellin for stealing
"Willpower" reached 200!
Win Claudia's second battle
Saved Ellin at the Tavern
Stopped the Noble from bullying Claudia
Win Ellin's first battle
Claudia completed her 30th Training
Completed the Undercover Mansion Mission
Ellin completed her first Prostitution Quest
Ellin completed her first Mercenary Commission
Ellin completed her first Training
Ellin completed her first "training" Conditioning
Ellin joined the team!
Win Claudia's first battle
Claudia completed her first Mercenary Commission
Completed the Bandit Mission
Claudia completed her first Prostitution Quest
Claudia completed her first Training
Claudia completed her first Conditioning
Earned All Achievements
Lose All Battles
Cleared Conqueror Mode.