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