In 2006, he won the ElbrusSpeed Climbing competition which he did by setting a new speed record, climbing from Azau station to the summit in 3 hours, 55 minutes and 58 seconds. This climb represents a vertical rise of almost 3,250 metres or more than 10,600 feet and thus a speed of more than 800 vertical metres an hour. He summited almost 40 minutes ahead of the next finisher. He has also won the Khan Tengri Mountain Festival when he speed climbed the mountain from Base Camp at 4,200 metres to the summit at 7,010 metres and then back to Base Camp in 12 hours and 21 minutes, winning by over 3 hours. He has climbed two 8,000 metre peaks in winter. Makalu in 2009 together with Simone Moro and Gasherbrum II in 2011 together with Cory Richards and again Simone Moro. He has also opened new routes on Cho Oyu, Manaslu and Broad Peak. All together he has 19 ascents of 8,000 metre peaks. He is also a "Snow Leopard" having summited the five 7,000 metre peaks of the former USSR in only 42 days in 1999. He climbs without additional oxygen. On 27 January 2018, Urubko along with Adam Bielecki - while taking part in the Krzysztof Wielicki led Polish winter expedition on K2 - led a rescue operation on Nanga Parbat to save climbers Élisabeth Revol and Tomasz Mackiewicz, who were stuck on the mountain. Bielecki and Urubko were brought to the mountain by helicopter and climbed over 1000m through the night to reach Revol. They succeeded in bringing Revol to safety, but, due to the severe weather conditions, were unable to save Mackiewicz. Then he resumed the K2 expedition, but due to the unfavorable snow and weather conditions and an accident causing injury to Rafal Fronia, the team canceled the planned approach via Cesen/Basque route and reached up to 7400m on the Abruzzi Spur route. Then in an unauthorized solo attempt Denis Urubko reported that he probably reached up to 7600m having drawn criticism from his fellow climbers. In 2019 remarkably, on 18 July, he summited Gasherbrum II by the normal route for acclimatization for his expedition to open a new route on Gasherbrum II. After 14 days, on 1 August 2019 at 8:40pm, he reached the summit of Gasherbrum II again via a new route without supplemental oxygen.
Climbs on 8000 meter peaks
1. Everest 2. Lhotse. 3. Hidden Peak 4. Gasherbrum II 5. Kangchenjunga 6. Shisha Pangma 7. Nanga Parbat 8. Broad Peak 9. Annapurna I 10. Broad Peak 11. Manaslu 12. Manaslu 13. Dhaulagiri 14. K2 15. Makalu 16. Makalu 17. Cho Oyu 18. Lhotse 19. Gasherbrum II 20. Kangchenjunga 21. Gasherbrum II 22. Gasherbrum II