Here is the full list of all 45 F1 2015 achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Complete 50 online races.
Drive 500 laps on European tracks in any game mode.
Place in the top 16 in qualifying in Pro Season mode 5 times.
Set 50 clean laps at Sochi in Time Trial in a Marussia.
Spend 180 minutes in total track time at Silverstone.
Complete 200 laps in Quick Race mode.
Stay out in 1st place for 150 laps in Quick Race mode.
Complete 50 clean laps in Quick Race mode.
Take 10 poles in Quick Race mode.
Complete 25 online races.
Drive a total of 78 laps at Monaco in Pro Season mode.
Complete a race in Pro Season mode.
Drive at least 20 laps on a track in each continent, in any game mode.
Set 50 clean laps in a Sauber on any track in Time Trial.
Complete an online race in the Hardcore Hopper.
Score 75 Constructors' Championship points in Quick Race mode.
Complete an online race in the Standard Hopper.
Reach 100 points in an online championship.
Complete 5 online races.
Win an online race.
Win a race in Quick Race, Championship Season and Multiplayer mode.
Win a race on the final lap, coming from behind.
Win the race from 22nd place on the grid in the 2014 Championship Season.
Set 50 clean laps at the Red Bull Ring in a Red Bull in Time Trial.
Spend at least 600 minutes out on track.
Set 100 clean laps in Time Trial on any combination of tracks.
Set 30 clean laps at Singapore in Time Trial.
Set 50 clean laps in a Williams on any track in Time Trial.
Load a Mid-Session Save.
Achieve the most poles within a Championship Season.
Win the Drivers' Championship in Championship Season on any difficulty.
Win the Constructors' Championship in Championship Season on any difficulty.
Get 14 wins in a single Championship Season to beat Michael Schumacher's record of 13 wins.
Complete a Championship Season race without colliding with another car or object.
Take pole, win the race, set the fastest lap and lead every lap in a Championship Season weekend.
Win 3 races at Monaco in Quick Race mode.
Set a clean lap time for all circuits in Time Trial.
Set a lap time at 5 different circuits in Time Trial in the wet.
Set a lap time at 5 different circuits in Time Trial in the dry.
Set a time at a Time Trial Event.
Finish ahead of your team mate in a practice session in Championship Season.
Complete an online race in the Beginner Hopper.
Take pole position in Championship Season.
Meet or exceed a race objective given to you from the team in Championship Season.
Get a podium in Championship Season.