Originally Posted by ZeroZet

You don't have to 3* every mission if you only want to get the girl, but she will be very gimped with 1 equip slot and level 1 skill if you aim for the bare minimum number of medals. In fact, she won't have her 4th slot unlocked unless you 3* ALL maps)
You can check the requirements for each reward tier if you click on the event banner on game's home screen.

Yep thats right and thats the reason i don't like Medal Collection Events because without the Skill and Equipment Slots Event 5* are no Match for there Gacha Counterparts. i completed all maps from Phase 1 but if there is any Stage i can't complete in Phase 2 then i have a gimped 5*... In fact its not worth to use an Event 5* with 1 Equipment and Skill Slot over a Gacha One (except Edelweiss and Lavender)