Couldn't get Pal-less Palace II achivement due to disconnection issue

Time: December 17,2016 around 03.00AM GMT+3
Frequency:Always(same issue confirmed by others)
World name:Zodiark
Character name:K'falkh Tian
Monster name:Nybeth Obdilord
Class/Level:Archer/60
Party or solo:Solo
Area and coordinates:Palace of the Dead Floor 101
In-game time:N/A
Steps:
1. I cleared floor 100 of Palace of Dead, without dying on floors 1-100 and didn't get the Pal-less Palace II achievement. But i did get the Pal-less Palace I, upon clearing floor 100.
2. Went to floor 101.
3. While in floor 101, the electricity went out in my house so i got disconnected from game, because the DSL modem closed due to no electricity
4. Appearently, the achievement is earned when you die after the required floor, which is not stated in achievement information. Even if that's how it works, i should be able to get the Pal-less Palace II achievement as i only got K.O. on floor 101 due to disconnection.
Connection Specs
- Type of internet connection/provider : DSL/Türk Telekom
- Modem maker/model number :ZyXEL VMG3312-B10B

From other reports on this, you have to trigger the closing scoreboard on floor 101+ following death to get the achievement. Disconnecting does not trigger this scoreboard but it does count as a party KO if it exits you from the dungeon. So now, you cannot go back in because you no longer meet the requirements and because you didn't trigger the scoreboard by actually dying you cannot get the achievement this way. Unfortunately, I think you'll have to start it again and I don't think anything can be done to just give you the achievement as a result.

Hopefully, this bug does get fixed properly at some point to give the achievement on clearing 100.