Here is the full list of all 21 Ultimate Racing 2D achievements.
Complete an event mode lvl with hard difficulty (or higher).
Win a championship on hard difficulty (or higher).
Win a race on hard difficulty (or higher).
Complete your team's objective in season mode with hard difficulty (or higher).
Get the fastest time in qualifying with hard difficulty (or higher).
Get the fastest time in qualifying.
Collect 1,000 coins in coin mode.
Win a championship for the first time.
Complete lvl 1 in event mode.
Win a race for the first time.
Complete your team's objective in season mode.
Win a race on ultimate difficulty.
Get the fastest time in qualifying with ultimate difficulty.
Win a championship with ultimate difficulty.
Collect 100,000 coins in coin mode.
Collect 1,000,000,000 coins in coin mode.
Complete your team's objective in season mode with ultimate difficulty.
Complete 10 seasons in season mode.
Complete event mode lvl 10.
Complete the final event in event mode.
Complete an event mode lvl with ultimate difficulty.