Acquire all Miracles (short path)

On my second PSN, I noticed that I'm only missing the "Acquire all Miracles" trophy to get my second Platinum.

I've started a new character (a Cleric) so I am a member of the Way of White covenant.

I need a little advice on what would be the shortest path to get all miracles because you need to belong to three separate covenants and follow the Siegmeyer quest line.

I also need to keep Rhea of Thoroulund alive long enough for her to reach Duke's Archives and I need to be a Sunbro rank +1 in ng+ to get the Sunlight Spear.

Is it possible to get this achievement/trophy by the time I get to the Sunlight Altar on ng+?

Yep it's possible, siegmeyer is about the only one you can screw up on, although rarely. The rest are easy peasy lemon squeezy.