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