Pal-Less Palace II clearly says "Clear the 1st through the 100th floors of the Palace of the Dead solo." I did this and yet I did not get the achievement. I understand some people are wiping past floor 100 and getting it, but no where in the achievement does it say you have to have 0 deaths or make it past floor 100. I made it to 100 solo, so based on requirement, shouldn't that earn the achievement? If the achievement is actually for getting to 101 with zero deaths, it should be explained differently, otherwise this is just a bug where you don't get the achievement you worked for.