List 5 critically acclaimed action anime. 
1. Attack on Titan
2. Fullmetal Alchemist: Brotherhood
3. Cowboy Bebop
4. Fate/Zero
5. Hunter x Hunter
Complete the following task based on the instruction and optional input provided.### Instruction:
List 5 critically acclaimed action anime. 

### Output:
1. Attack on Titan
2. Fullmetal Alchemist: Brotherhood
3. Cowboy Bebop
4. Fate/Zero
5. Hunter x Hunter