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