Challenge 1: Circumnavigate the planet.
This challenge has been successfully completed! I made it all the way around!
Challenge 2: Do so using only my bicycle (or perhaps bicycles) overland and boats on water (No planes, no buses, no trains, no cars).
This task has also now been completed! I had to restart the attempt in Mori, Western China in October 2014. On 8th February 2018 we returned to Mori, completing a continuous circumnavigation entirely by bicycle and boats!
Challenge 3: Pass through antipodal points.
Challenge 4: Visit all the inhabited continents.
Europe, Asia, Australia and North America have been well and truly visited. South America and Africa are in our sights. Antarctica is unikely.
Challenge 5: Cycle at least 100,000 kilometres.
Challenge 6: Cycle in 100 countries (UN member states).
1. France. 2. Belgium. 3. Luxembourg. 4. Germany. 5. Netherlands. 6. Denmark. 7. Sweden. 8. Norway. 9. Finland. 10. Russia. 11. Estonia. 12. Latvia. 13. Lithuania. 14. Poland. 15. Belarus.16. Czech Republic. 17. Austria. 18. Liechtenstein. 19. Switzerland. 20. Slovakia. 21. Hungary. 22. Ukraine. 23. Moldova. 24. Romania. 25. Bulgaria. 26. Turkey. 27. Georgia. 28. Azerbaijan. 29. Armenia. 30. Iran. 31. Turkmenistan. 32. Uzbekistan. 33. Tajikistan. 34. Kyrgyzstan. 35. Kazakhstan. 36. Mongolia. 37. China. 38. Laos. 39. Thailand. 40. Vietnam. 41. Cambodia. 42. Malaysia. 43. Singapore. 44. Indonesia. 45. Australia. 46. Vanuatu. 47. Fiji. 48. United States of America. 49. Canada. 50. United Kingdom. 51. Ireland. 52. Italy. 53. San Marino. 54. Slovenia. 55. Croatia. 56. Bosnia and Herzegovnia. 57. Montenegro. 58. Albania. 59. Macedonia. 60. Serbia. 61. Greece. 62. South Korea. 63. Japan. 64. Mexico. 65. Guatemala. 66. Belize. 67. El Salvador.
Challenge 7: Return with more money than I start with.
Well, I don't want to give away the exact details of my bank balance, but thanks to relatively good sales of No Wrong Turns and Into the Sunrise I've got a chance.