Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

12 Gates of Luxor Temple (14 points): Match 12 or more spheres with a single shot.
5 Days of Thoth (15 points): Put together 5 chain reactions.
Life! Health! Prosperity! (15 points): Complete a level without losing a life.
Feather of Ma'at (15 points): Complete Adventure Mode on the Easy difficulty level.
Pharaoh's Treasury (16 points): Collect 100 pieces of gems and jewelry.
Royal Sharpshooter (16 points): Complete a level with 100% accuracy.
Golden Ankh Coin (16 points): Collect 15 or more coins in a single level.
Horns of Hathor (17 points): Complete Adventure Mode on the Normal difficulty.
Glory of Osiris (18 points): Achieve a perfect rating on all bonus rounds.
Magic of Isis (19 points): Complete Adventure Mode on the Expert difficulty level.
Challenge of Horus (19 points): Complete the Challenge of Horus.
Pharaoh of the Two Lands (20 points): Earn the play rank of Pharaoh of the Two Lands.