The Practice Makes Perfect trophy/achievement in Gotham Knights can be obtained by completing all of the training missions at the Training Area in the Belfry. Each of these training sessions focuses on a different aspect of combat for you to master. Only a set amount of these are available at the start of the game. You can unlock more by progressing the story. Below is a list of the training missions and which category they fit into.

Basic Training
- Interrogation
 - Grabbing Enemies
 - Stealth
 - Combos
 - Guard Break
 - Ranged Attacks
 - Smoke Bombs
 
Abilities Training
- Momentum
 - Momentum Abilities: Guard Break
 - Momentum Abilities: Piercing
 
Advanced Training
- Perfect Evade
 - Timed Strikes
 - Attack Chains
 
For more guides on Gotham Knights check our main guide page here!

