Here is the full list of all 27 Tour de France 2015 achievements worth 1,000 gamerscore.
Win a Quick Tour with the default stages (minimum difficulty = "Professional")
Win a hilly stage (minimum difficulty = "Professional")
Beat all gold times in Challenge mode
Win the Critérium International in Pro Team (minimum difficulty = "Professional")
Finish a stage in cooperation mode
Win a stage with a young rider (under 25 included)
Win a flat stage (minimum difficulty = "Professional")
Win a mountain stage (minimum difficulty = "Professional")
Win a stage with a negative race-day condition (minimum difficulty = "Professional")
Win a stage with a rider without specialisation (minimum difficulty = "Professional")
Win an individual time-trial (minimum difficulty = "Professional")
Beat a silver time in Challenge mode
Beat a gold time in Challenge mode
Take part in the Critérium du Dauphiné in Pro Team
Beat a bronze time in Challenge mode
Finish a stage
Breakaway for, at least, 10 kilometres
Relay at the front of the peloton
Attack during a stage
Perform warm-up
Purchase a rider with a score of over 80 in Pro Team
Take part in the Tour de France in Pro Team
Win the Critérium du Dauphiné in Pro Team (minimum difficulty = "Professional")
Win the Tour de France in Pro Team (minimum difficulty = "Professional")
Win the Critérium, the Dauphiné and the Tour in Pro Team (minimum difficulty = "Professional")
Win the Tour at "Champion" difficulty, taking part in the 21 stages
Complete all missions of a team in Tour de France (minimum difficulty = "Champion")