This is for a web app for users Male/Female, Between 15-35 yrs old. Cant reveal more sorry :S
Whats better for the user?
Option A: Notification when an achievement has been made (you can tap it an go to the achievements page) and Also if you open the menu you`ll see a "+1" number in the achievement section so you can enter into it and review your achievements
Option B: A notification that prompts in your screen that says what achievement you've reached and the award (You have to tap/click "ok" to dismiss the notification)and Also if you open the menu you`ll see a "+1" number in the achievement section so you can enter into it and review your achievements
I believe the "Option A" its better for my own experience on things like this but the real question is what the majority thinks.