(From the collector's edition guide to mass effect 3page 323)
"If you imported a save where the collector's base was saved, then these are your possible endings:
*If your Readiness Rating is below 1,750 points, Earth is destroyed regardless of the choice to destroy the Reapers or become one.
*At a 1,750 Readiness Rating, if you choose to destroy the Reapers, Earth is destroyed.
*At a 2.050 Readiness Rating, if you choose to become a Reaper, Earth is saved.
*At a 2,350 Readiness Rating, if you choose to destroy the Reapers, Earth is devastated but still there.
*At a 2,650 Readiness Rating, if you choose to destroy the Reapers, Earth is saved.
*At a 2,800 Readiness Rating, you're able to create synergy between organics and synthetics, saving Earth and the galaxy.
*At a 4,000 Readiness Rating, if you choose to destroy the Reapers and "saved" Anderson, Shepard lives.
*At a 5,000 Readiness Rating, if you choose to destroy the Reapers and did not :save" Anderson, Shepard lives.
If you imported a save where the collector's base was destroyed or you didn't import a Mass Effect 2 save, then these are your possible endings:
*If your Readiness Rating is below 1.750 points, Earth is destroyed regardless of the choice to destroy the Reapers or become one.
*At a 1,750 Readiness Rating, if you choose to become a Reaper, Earth is destroyed.
*At a 1,900 Readiness Rating, if you choose to destroy the Reapers, Earth is devastated but still there.
*At a 2,350 Readiness Rating, if you choose to become a Reaper, Earth is saved.
*At a 2,650 Readiness Rating, if you choose to destroy the Reapers, Earth is saved.
*At a 2,800 Readiness Rating, you re able to create a synergy between organics and synthetics, saving Earth and the galaxy.
*At a 4,000 Readiness Rating, if you choose to destroy the Reapers and "saved" Anderson, Shepard lives.
*At a 5,000 Readiness Rating, if you choose to destroy the Reapers and did not "save" Anderson, Shepard lives"