There are a lot of Assassin's Creed 2 Glyph Guide out there, but if you really want a definitive guide for simply all answers for the Glyph Puzzles, simply proceed to mycheats's page.
Assassin s Creed 2 Glyphs answers
The Truth Puzzles Glyphs 1 - 10
The Truth Puzzles Glyphs 11-20
Assassin's Creed 2 Feathers Guide
For maps and video walkthrough please proceed to Assassin's Creed 2 Glyph Guide