Rafferty was fired from the band on 31 January 2008, after a series of absences due to illness and long-standing rumours about his place in the band; drug addiction was also quoted as one of the reasons for his departure. Rafferty subsequently refuted these claims, saying that he had been fired from the band because he "didn't think Konk was very good, and I said that." Dan Logan, bassist with a local Brighton band Cat the Dog, was drafted in as a temporary replacement for Rafferty. After the departure of Rafferty, the band had considered splitting up. Singer Luke Pritchard had told The Sun's Something for the Weekend that "Splitting does go through your mind. It's hard to let go of something you care about so much. We have fans to think of." Pritchard also discussed the possibility of Dan Logan joining the band as their new bassist, "It's been really strange for us but it's something that had to happen. Dan hasn't joined the band properly yet. We're trying him out, but I love playing with him." In October 2008, Peter Denton - who had previously filled in for Rafferty during the Inside In/Inside Out touring cycle - was chosen as the permanent bassist.  The Kooks released their second album, Konk, in April 2008. The record was named after the studio where it was recorded and produced by Tony Hoffer, who worked on the band's debut album, Inside In/Inside Out. Prior to releasing the album, in an interview with NME, lead singer Luke Pritchard had claimed to have 80-90 songs written for the album, stating, "I want this album to be big......I've got an ego, I want the album to do well. I want our singles to come on the radio and for people to literally have their heads blown off by them". Recorded over a total of seven weeks in London and Los Angeles Pritchard told NME the band had wanted more input into their second album. "Tony's a genius, but this time we wanted more involvement in the production," said Pritchard.  Konk went on to debut on the UK Albums Chart at number one with first week sales of 65,901 units. The album also spawned three top 50 hits including their highest chart performer to date, "Always Where I Need to Be", which peaked at number three. In the United States, it reached number 41 on the Billboard 200 and the album's first single, "Always Where I Need to Be", peaked at number 22 on the Alternative Songs chart. The album was certified gold in both the UK and Ireland. A second limited edition two disc version of Konk entitled RAK was also released. The name was taken from the London studio where The Kooks recorded seven new live tracks along with the Arctic Monkeys and Mike Crossey, producer for The Zutons.  Allmusic said with Konk, The Kooks "explores pop and rock in all their glory," while BBC Music described their second album as "a little contrived with the recycling of old guitar lines and intros." NME suggested the departure of Rafferty affected Konk's production, stating "Konk is the sound of a band in disarray, unsuccessfully attempting to hold things together."

Answer this question "what was his greatest accomplishment?" by extracting the answer from the text above.
Konk went on to debut on the UK Albums Chart at number one with first week sales of 65,901 units.