Crossing the Line 20
Finish 50 races online.
Play battles and races online and this will unlock after finishing 50 of them. Unlocks when the last player finishes the race and stats are uploaded. Custom tracks do not count
Master Thief 30
Steal 80 flags while playing Capture the Flag or other battle matches.
Go into a player or ranked battle match online. A flag will be on the radar to pick up. When an opponent has it drive into them to steal it. Do this 80 times. Can be boosted easily by driving into each other over and over.
Deliver 100 flags in Capture the Flag or other battle matches.
Go into a player or ranked battle match online. A flag will be on the radar to pick up. Deliver it to the destination. Repeat 99 more times to get this. Easiest done in a Basewar as each of you have a base and a flag. Highway 101 seems to be the easiest race to do a basewar on
Ranking Up 30
Win 20 ranked matches online.
Race online in ranked matches and win 20 times. Unlocks when the last player finishes the race and stats are uploaded. If the other players quit out you still get a win towards this
Where in the World? 10
Find half of the collectables in Los Angeles.
See "Waldo's Still Missing"
Waldo's Still Missing 40
Find all the collectables in Los Angeles.
To do them all at once with the map in the link below you should. Pause and go right to Modes tab and select Race Editor > Create race. You will now be able to press back and go to where you want and press back again to drop yourself there
The following thread has the answer
Retire the Master 50
Beat the City Champ.
Progress through the missions until challenged by the city champ (Brooke). Complete the races against them to get this. Video of the challenge as follows:
Mild Dedication 10
In Goal Attack, complete every goal for one race.
See True Dedication
True Dedication 100
All Goal attacks must be unlocked and every goal for every race completed.
Pause and press right to the modes tab. Select Goal Attack. Each consists of 4 goals. Finish 1st, Finish with less than 25% damage, Finish in X time, and Do all of these tasks in one race. List found at the following page:
Thanks to the following for their help:
Shook One, Ham Man 89, CraftyReaper, JACA86Pl, Cheezbrgr