Bachmann grew up in the Fossvogur area of Reykjavík, Iceland before moving to Breiðholt when he was 10 years old. He did not do well in school in the early years. Looking back he remembers, that he was barely able to read or write before changing schools from Fossvogur to the one in Breiðholt.
Bachmann graduated from the Icelandic Drama School in 1991. Since graduation he has worked with theatre groups in Reykjavík and Akureyri and was president of the latter for a few years. He has held many acting courses, and has served as a teacher at both the Icelandic Drama School and the Icelandic Film School. In 2013 he worked with the National Theatre of Iceland.
Before every premiere Bachmann goes to the gym, goes swimming and finishes off with a sauna. "This is something I've always done and goes with every film or stage premiere".
- Íslenski draumurinn (English title The Icelandic Dream) (2000)
- A Man Like Me (English title A Man Like Me) (2002)
- Strákarnir okkar (English title Eleven Men Out) (2005)
- Blóðbönd (English title Thicker Than Water) (2006)
- The Quiet Storm (2007)
- Volcano (2011)
- Stormland (2011)
- Either Way (2011)
- Life in a Fishbowl (2014)
- Trapped (2015-2016)
|2005||Edda Award||Best Supporting Actor||Strákarnir Okkar||Nominated|
|2007||Edda Award||Best Supporting Actor||Veðramót||Nominated|
|2011||Edda Award||Best Supporting Actor||Órói||Won|
|2012||Edda Award||Best Supporting Actor||Eldfjall||Nominated||Nominated twice in the same category.|
|2012||Edda Award||Best Supporting Actor||Á annan veg||Won||Nominated twice in the same category.|
|2013||Edda Award||Best Supporting Actor||Pressa||Nominated|
|2015||Edda Award||Best Actor||Life in a Fishbowl||Won|
|2015||Gríma Award||Best Actor||Endatafl||Nominated||Gríman is the Icelandic Award for achievements in theatre.|
- "Þorsteinn og Hera leikarar ársins". RÚV. Retrieved 2016-04-13.
- Jóhannesdóttir, Áslaug Karen (2014-08-29). "Ólæs og óskrifandi tíu ára gamall". DV. Retrieved 2016-04-13 – via www.dv.is.
- "Um höfundinn: Leikfélag Akureyrar - leikfelagakureyrar.blog.is". leikfelagakureyrar.blog.is. Retrieved 2016-04-13.
- "Kennarar / Leiðbeinendur". Kvikmyndaskóli Íslands. Retrieved 2016-04-13.
- "Þjóðleikhúsið - Leikarar". www.leikhusid.is. Retrieved 2016-04-13.
- "Þyngdist og léttist á víxl". www.mbl.is. Retrieved 2016-04-13.
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