How many endings are there?

[shigad]

I've replayed the game several times, and so far I've only gotten two endings - the one titled "Hope", and the really, mega bad one In which May commits suicide .

Are there any additional endings?

[ilytwo]

There are 4 i believe

[Vordinar]

There is one for each achievement, but the endings are just that, the ending of the play through.
You can have 5 play throughs with the same ending and wildly different interactions/choices.

The endings are missed, forgive, hope & survivor.