[1] Kristinn played 19 seasons with ÍR, winning the national championship seven times.
[3] Kristinn played 79 games for the Icelandic national basketball team from 1970 to 1981.
[4] Kristinn was the head coach of ÍS men's team from 1982 to 1984, guiding them to the Division I championship in 1984 and a promotion to the Úrvalsdeild.
[7][8] Kristinn played two games for the Icelandic national football team.
[1] Kristinn's nephew, Andri Rúnar Bjarnason, was the top goal scorer in Úrvalsdeild karla in 2017.