此前曾有玩家依据《蝙蝠侠：阿卡姆之城》PS版的成就信息推测，哈莉·奎因的DLC即将推出。截至目前，开发商Rocksteady尚未对此进行官方确认。
不过，种种迹象表明小丑女的DLC可能性极大。开发商在官方Twitter上发布了哈莉·奎因的宣传照，其中不仅展示了她的疯人院套装，还出现了她的标志性大锤。
（热点回顾）DLC的消息最早源于游戏本体的成就包。Eurogamer发现的PS3成就清单暗示，玩家将有机会扮演这位疯狂的角色。罗宾的DLC也已确认，他在战役中初次登场，虽然身着绿衣，但披风增添了几分英雄气概。
目前，玩家们的焦点集中在奎因身上，她的攻击招式与武器装备尚属谜团，令人期待。华纳兄弟对此暂无回应，大家只能耐心等待。
以下是暗示DLC的部分成就列表： Lost Property [Bronze] – No crimefighter should be without this Breaking and Entering [Bronze] – Find a way into the secret base How’s It Hanging? [Silver] – Clean up the Dry Docks The Last Laugh [Silver] – The joke’s on who? Frequent Flyer [Bronze] – Zip Kick 3 different thugs Battering Ram [Bronze] – Shield Bash 5 different thugs Snap To It [Bronze] – Snap Flash an unarmed thug, an armed thug, an environmental object and a Titan Bomb Squad [Bronze] – Defuse all bombs in 3 minutes or less A Few New Tricks [Bronze] – Use 5 different Quickfire gadgets in one fight as Robin in Harley Quinn’s Revenge Party’s Over [Silver] – Destroy all Harley Balloons