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
Lose All Battles
Ellin completed her 20th Mercenary Commission
Ellin End
Ellin completed her 30th Conditioning
Claudia End
"Dexterity" reached 200!
True End
Win Ellin's third battle
"Agility" reached 200!
Watched Ellin dance
Fed the birds with Claudia
"Willpower" reached 200!
Claudia completed her 20th Mercenary Commission
"Stamina" reached 200!
"Strength" reached 200!
Saved Ellin at the Tavern
Ellin completed her 30th Training
Claudia completed her 30th Training
Reach any Ending
Bad End
Claudia completed her 20th Prostitution Quest
"Obedience" reached 200!
"Kinkiness" reached 200!
"Technique" reached 200!
"Seduction" reached 200!
"Lewdness" reached 200!
Claudia completed her 30th Conditioning
Accumulate 100000 G worth of wealth
Win Claudia's third battle
Win Ellin's second battle
Completed Claudia's Oiran Request
Punished Ellin for stealing
Win Claudia's second battle
Stopped the Noble from bullying Claudia
Win Ellin's first battle
Ellin completed her first Mercenary Commission
Completed the Undercover Mansion Mission
Ellin completed her first Prostitution Quest
Ellin completed her first Training
Ellin completed her first "training" Conditioning
Ellin joined the team!
Claudia completed her first Mercenary Commission
Win Claudia's first battle
Completed the Bandit Mission
Claudia completed her first Prostitution Quest
Claudia completed her first Training
Claudia completed her first Conditioning