Harry Potter and the Half-Blood Prince Cheats - Xbox 360

Achievements
Complete each achievement to get the allotted gamerscore:

Burrow Defender (20) - Successfully protected The Burrow.
Combo Flyer Badge (10) - Earn the Combo Flyer Badge.
Adventure completed (100) - Conclude the adventure.
Crest Collector 01 (10) - Complete Crest Collector Level 1.
Crest Collector 02 (10) - Complete Crest Collector Level 2.
Crest Collector 03 (10) - Complete Crest Collector Level 3.
Crest Collector 04 (10) - Complete Crest Collector Level 4.
Crest Collector 05 (20) - Complete Crest Collector Level 5.
Crest Collector 06 (20) - Complete Crest Collector Level 6.
Crest Collector 07 (20) - Complete Crest Collector Level 7.
Crest Collector 08 (20) - Complete Crest Collector Level 8.
Crest Collector 09 (30) - Complete Crest Collector Level 9.
Crest Collector 10 (30) - Complete Crest Collector Level 10.
Crest Collector 11 (30) - Complete Crest Collector Level 11.
Crest Collector 12 (40) - Complete Crest Collector Level 12.
Crest Collector 13 (50) - Complete Crest Collector Level 13.
Crest Collector 14 (60) - Complete Crest Collector Level 14.
Duelling Champion (10) - Earn the Duelling Club Champion Badge.
Duelling Beginner (10) - Earn the Duelling Beginner's Luck Badge.
Duelling Veteran (20) - Earn the Duelling Veteran Badge.
Grime Buster (10) - Clean up after Fred and George at The Burrow.
Hidden the Book (20) - Hide the Half-Blood Prince's Potions Book.
Escaped the Cave (40) - Escaped the Cave.
Good Deed (20) - Help the student retrieve her stolen Gobstone.
Great Mate (20) - Help Ron avoid Lavender.
Great Party (10) - Create a great Christmas party for Slughorn.
Portrait Pro (20) - Use all of the portrait shortcuts.
Potions Beginner (10) - Earn the Potions Beginner's Luck Badge.
Potions Club Star (10) - Earn the Potions Club Star Badge.
Keen Flyer Badge (20) - Earn the Keen Flyer Badge.
Master Duellist Badge (50) - Earn the Master Duellist Badge.
Master of Flying (50) - Earn the Master of Flying Badge.
Master Potioneer (50) - Earn the Master Potioneer Badge.
Mystery Solved (20) - Retrieved Slughorn's missing memory.
Portrait Novice (10) - Use your first portrait shortcut.
Quidditch Captain (10) - Assemble the Gryffindor Quidditch Team.
Quidditch Champion (30) - Won the Quidditch Cup.
Reflex Badge (10) - Earn the Reflex Badge.
Potions Club Veteran (20) - Earn the Potions Club Veteran Badge.
Precision Flyer Badge (10) - Earn the Precision Flyer Badge.
Quidditch Beginner (10) - Earn the Quidditch Beginner's Luck Badge.
Speedy Brewer Badge (10) - Earn the Speedy Brewer Badge.
Used the Pensieve (10) - View Dumbledore's first memory of Tom Riddle in the Pensieve.

Hogwarts Crest Bonuses
Collect crests to unlock various bonuses:

003 Crests - Two Player Dueling Pack 1: Draco & Luna.
008 Crests - More health in duels.
014 Crests - Two Player Dueling Pack 2: Training Ground Dueling Arena.
021 Crests - Dungbombs in prank boxes around Hogwarts.
029 Crests - Two Player Dueling Pack 2: Crabbe & Goyle.
038 Crests - Score boost in flying events.
048 Crests - Exploding Cauldrons in prank boxes around Hogwarts.
059 Crests - Two Player Dueling Pack 4: The Transfiguration Dueling Arena.
071 Crests - Even More health in duels.
084 Crests - Two Player Dueling Pack 5: Ginny & Hermione.
098 Crests - Love Potion in Potions Club.
113 Crests - Two Player Dueling Pack 4: Paved Courtyard Dueling Arena.
129 Crests - More mini-crests with each cast.

Easy Mini-Crests
You can get a large amount of Mini-Crests one time only, when you have used the Luck Potion and are making your way to Herbology. At this point, every time you use Diffindo to get the Mini-Crests to appear, you will get the full amount of Mini-Crests available, due to your luck. Get as many as possible at this point to help reach the 25,000 pieces goal.

Winning Fights and Duels
An easy way to win almost any fight or duel is to cast Levi Corpus or Petrificus Totalus. Then just charge your Stupefy until it chimes twice, then release it. It will result in a one hit victory until later in the game, then it will require two. Note: This does not work on Fenrir Greyback.

Use the following combo to defeat any enemy. Use Expelliarmus to knock them down. Charge up your Stupefy. While getting it charged, walk directly next to your dueling opponent. Fire your charged Stupefy for a one hit kil. This trick can give you 5 stars for the challenge very quickly and easily.