Here is the full list of all 24 Target Practice achievements.
Get 1,000,000 score.
Get 1,000,000,000 score.
Have 25 targets active.
Have 50 targets active.
Have 100 targets active.
Stay alive for five minutes.
Stay alive for ten minutes.
Stay alive for twenty minutes.
Set a variable to 1,000 or more.
Set a variable to a negative number.
Set Air Resistance to 4 or less and Target Thrust to 700 or less. Then survive for 5 minutes.
Set Air Resistance to 2 or less and Target Thrust to 500 or less. Then survive for 5 minutes.
Set Air Resistance to 1 or less and Target Thrust to 300 or less. Then survive for 5 minutes.
Set one Ability Cooldown to 5 or less.
Set two Ability Cooldowns to 5 or less.
Set all Ability Cooldowns to 5 or less.
Click 1,000 targets.
Click 10,000 targets.
Click 100,000 targets.
Click 100 targets below the Low Score Line.
Click 1,000 targets below the Low Score Line.
Click 10,000 targets below the Low Score Line.
Look at the credits.
Bounce a Target during Time Pause.