Duelling Demon 30
Won all blackboard duelling groups
While in Dumbledore's Office, go to the blackboard and select it. Go to the dueling section and defeat the person from each group. This should take about 15 minutes.
Potion Perfectionist 40
Completed all blackboard potions classes
While in Dumbledore's Office, go to the blackboard and select it. Go to the potions option and pass all ten of the potion courses taught by Professor Snape. This should no be very hard at all and should take no more than 45 minutes.
Super Spell-caster 15
Practised all blackboard spells
While in Dumbledore's Office, go to the blackboard and select it. Go to the Spells section and successfully cast all seven spells at least once. This should take you only about 5 minutes to do since you only need to cast each spell successfully one time.
Multiplayer Master 10
Played all multiplayer games
While in Dumbledore's Office, go to the blackboard and select it. Go to the multiplayer section and play each of the three minigames. You do not need a second person for any of the games so you can get this playing by yourself. You do not need to win the minigames either, only play them. This is an extremely easy achievement and only takes about 2 minutes or so.
Daring Dodger 30
Won all blackboard dodging games
While in Dumbledore's Office, go to the blackboard and select it. Select the dodging minigame and you will be dodging the branches from a willow tree, just duck and jump at the appropriate times. You will need to complete this in easy, medium, hard, and extreme difficulties, with the next difficulty being unlocked after completing the one before it. This isn't very hard, just pay attention and always land your jumps in ducked form, that way you only need to worry about the jumping branches.
Song Specialist 10
Listened to all the Sorting Hat's songs
While in Dumbledore's Office, use your hand to swipe until you see the Sorting Hat, select him and let him play all three of his songs.
Burning Day Bystander 10
Saw Fawkes burst into flames
While in Dumbledore's Office, use your hand to swipe until you see Fawkes, the bird. Select him by holding your dominant hand upward, rub the bird as if you were petting him, in about 25 seconds he will burst into flames.
Duelling Dervish 25
Defeated all possible opponents in blackboard duels
While in Dumbledore's Office, go to the blackboard and select it. Go to the dueling section and defeat each person from each group.
Students: Oliver, Cedric , Draco
D.A: Ginny, Cho, Neville, Luna
Hogwarts Staff: Snape, Quirrell
Order : McGonagall, Dumbledore, Sirius
It is random who you will be matched up with, so just keep quitting and restarting until you get to somebody you have not fought yet.
Ultimate Unlocker 50
Unlocked all blackboard games
Just keep on playing throughout the blackboard. Once you unlock the extreme difficulty for the dodging minigame this achievement will unlock. You shouldn't need to try to get this one if you are playing to get all the other blackboard achievements.
Familiar Face 10
Scanned your face
When starting a new game, you'll be given the choice of movie mode or custom mode. You can either select custom mode and then scan your face when the screen prompts you too. Or choose movie mode and after you complete all year one activities select the polyjuice potion while in Professor Dumbledore's office and then select custom character from the selection screen.