Easy "Dark Knight" Trophy
After you get the sword and chase the dragon away in Chapter 7, enter the justice dream sequence found where the dragon was at. Complete the sequence, then backtrack to the beginning to where the deer was found. The fastest way there is to go down the steps across from where the dragon was located. Slash the deer with your sword and it will go to the altar. Slash it again to sacrifice it.
Easy "Little Monk" Trophy
After you get the sword at the start of Chapter 7, return to the room where the wizard skeleton was found. Do this by going back outside to the location where the deer is found then climbing back down the ladder. You will find the entrance to the room with the wizard skeleton. You can now take the mask from the wizard's face.
Easy "Little Warrior" Trophy
In Chapter 1, leave the room with the wizard and ascend the ladder. Move all the way to the right to the altar, then step on the symbols in the correct sequence. To learn what that is, step back slightly and look up at the stars. Successfully entering the sequence will unlock a grate. Go to the tower and enter the room where that grate is found. Once there, you will find a wall with a large hand on it. The chainmail is stuck between the stones in that wall. Keep pulling the chainmail until it comes out. Note: Before unlocking the grate, the chainmail will be visible but cannot be taken out from the wall.
Easy "Dark Knight" Trophy...