The interesting thing is that DS: Remastered has a HUGE clear rate compared to the others. If you added a knight's honor or all rings type achievement to Dark Souls 2, which has limited enemy spawns per ascetic (I think it is 12) the game's clear rate might be below 1%, to guess at OP's Question.
I double checked and it is strangely almost exactly the same clear rate across titles. However, I did clear SotFS because I felt at least it had a few differences from the original title.The steam achievement rates for 'The Dark Soul' for PC are: Dark Souls: Prepare to Die Edition 2.4% Dark Souls: Remastered 3.5% ( I do not have this one) Dark Souls II 2.8% Dark Souls II: Scholar of the First Sin 2.8% Dark Souls III 2.8%
I have the Dark Soul achievement for all PC Dark Souls titles except DS:Remastered, as I felt clearing Prepare to Die is basically exactly the same.