I would personally like to see a return of the nameless hero (custom character) because playing as my own character makes me feel like a part of the story apposed to playing as set characters plus you still have to get revenge on the Armored Titan for killing your family and your friends hope you return to the so I hope you do come back in A.O.T 3. A 2013 Unity-based browser game based on the popular anime and manga series Attack on Titan (進撃の巨人).

Successfully complete one of the following tasks to get a trophy:

We'll make a breakthrough eventually... And see what truth these Walls are hiding. (Platinum): Acquired all trophies.
I'm gonna destroy them! Every last one that's on this earth! (Gold): Completed all Story Mode Dire Eliminations.
It's not so bad, being a goddess and all. (Gold): Leveled all characters to max friendship.
The outside world must be a hundred times bigger than inside the Walls! (Gold): Reached 100% Gallery completion.
As long as we keep fighting, we've still got a chance. (Silver): Used 1,000 Wings of Freedom.
Devote your heart! (Silver): Unlocked all characters.
Don't be stupid. I've always been talkative. (Silver): Leveled one character to max friendship.
He was a soldier who fought to the very end. (Silver): Completed the final chapter in Story Mode.
Hmm... Not bad... (Silver): Leveled the protagonist to max level.
I'll be the one to hunt those Titans to extinction! (Silver): Completed all Scout Missions.
I'm just glad it didn't turn out any worse... (Silver): Saved 100 or more comrades.
If you don't fight, you can't win. (Silver): Achieved a Battle Rating of S in all Story Mode episodes.
If you don't know about something, you just have to learn it. (Silver): Reached 50% Gallery completion.
Just shut your mouths and invest everything in me! (Silver): Used more than 100,000 Regiment Funds in total.
More... Must kill more... (Silver): Eliminated a total of 1,000 enemies.
My specialty is tearing through flesh. (Silver): Got 2,000 total body part destructions.
No matter what you train in, it will serve humanity some day. (Silver): Maxed out all training.
Sorry, buddy, but I'm just a natural. (Silver): Leveled one character to max rank.
Well, you see... It's just seething with rage! (Silver): Maxed out Titan Research Room level.
You mind if I take that? (Silver): Sent 50 gifts.
Avoid unfavorable battles. (Bronze): Built 100 bases in battle.
Don't worry... Just keep training. (Bronze): Got selected as the top performer during training in Episode 1 of the Story Mode prologue.
I know we can win this if we work together! (Bronze): Used a Buddy Action.
I was able to control myself perfectly. (Bronze): Avoided 100 Titan attacks.
I'll wrap that around you as many times as you want. (Bronze): Completed Story Mode Chapter 5.
I'm the deliverer of death! (Bronze): Eliminated a Titan with the Hook Drive.
It's great to have something you could put your life on the line for... (Bronze): Completed 100 Side Missions.
It's huge! What the heck is it? (Bronze): Completed your first Dire Elimination.
Live a life that you can be proud of. (Bronze): Completed Story Mode Chapter 4.
No need to hold back. (Bronze): Increased friendship rank.
There's still so much I need to find out about the world. (Bronze): Completed 25% or more of the Scout Missions.
This attack will be the final blow! (Bronze): Successfully completed a Sneak Attack.
This first step will be a big one for the human race. (Bronze): Completed Story Mode Chapter 1.
This is a true salute! (Bronze): Had over 100 allies join.
This world has always been a living hell. (Bronze): Had over 100 allies die.
We're always at an information disadvantage against the Titans. (Bronze): Reached 25% Gallery completion.
We've got a talented one here. (Bronze): Achieved a Battle Rating of S in any episode.
What do you expect? The world is a cruel place. (Bronze): Completed Story Mode Chapter 3.
What is it that you see? (Bronze): Completed Story Mode Chapter 2.
What must be done. (Bronze): Completed 50% or more of the Scout Missions.

Successfully complete the indicated mission in Attack mode to unlock the corresponding character in Expedition mode:

Annie Leaonhart: Successfully complete 'The World The Girl Saw' mission.
Bertolt Hoover: Successfully complete the 'At The Edge Of The Forest' mission.
Christa Lenz: Successfully complete the 'At The Edge Of The Forest' mission.
Erwin Smith: Successfully complete the 'Soldiers Dance' mission.
Hange Zoe: Successfully complete the 'Return To Trost District' mission.
Levi: Successfully complete the 'Scout Regiment' mission.
Reiner Braun: Successfully complete 'The World The Girl Saw' mission.

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

All Requirements Achieved (100 points): Acquired all achievements.
Survey Merit 1 (10 points): Reached 25% Survey Mission completion.
Survey Merit 2 (20 points): Reached 50% Survey Mission completion.
Survey Merit 3 (50 points): Reached 100% Survey Mission completion.
Reliable Comrade (10 points): Completed 10 requests.
Hope for Everyone (30 points): Completed all requests.
Exceptional One (10 points): Achieved a Battle Rating of S in an episode.
Continuous Subjugation Medal (20 points): Performed 10 Complete Subjugations in a row during one battle.
Largest Count of Subjugation Medal (50 points): Performed 50 Complete Subjugations during one battle.
Complete Subjugation Medal (50 points): Achieved a Battle Rating of S in all Attack Mode episodes.
Journey to the Unknown 1 (20 points): Reached 10% Gallery completion.
Journey to the Unknown 2 (20 points): Reached 25% Gallery completion.
Journey to the Unknown 3 (30 points): Reached 50% Gallery completion.
Journey to the Unknown 4 (50 points): Reached 100% Gallery completion.
First Class Soldier (20 points): Reached maximum Soldier Skill with a character.
Strongest Army Corps (30 points): Reached maximum Corps Skill.
First Time for Development (10 points): Developed a weapon.
Necessary Investment (30 points): Used more than 100,000 Corps Funds in total.
Devote Your Lives to the Cause!! (30 points): Unlocked all characters.
Counterattack Roar (10 points): Subjugated a Titan with Eren.
The Greatest Soldier of All Humanity (10 points): Subjugated a Titan with Levi.
Results of Training (10 points): Engaged in omni-directional movement for 1 minute without landing.
Lightning Speed (10 points): Subjugated 10 Titans within 1 minute.
Trustworthy Comrades (10 points): Had an ally join.
Mutual Support (10 points): Saved a friend.
Don't Miss an Opportunity (10 points): Activated a Decisive Battle Signal.
Complete Victory (20 points): Fought to victory in 10 battles without taking any damage.
Overcome a Life and Death Situation (20 points): Avoided 30 Titan attacks in Focus Time.
Resourcefulness (20 points): Completed a total of 30 side-missions.
Thorough Preparation (20 points): Used items a total of 100 times.
Fight!! (50 points): Subjugated a total of 1,000 enemies.
Exceptional Subjugation Teamwork (20 points): Damaged a total of 100 parts.
Strong Team (20 points): Allies damaged a total of 100 parts.
Honorable Salute (20 points): Had over 100 allies join.
Overcome the Fear of Death (10 points): Experienced over 100 friendly unit deaths.

Additionally, there are eight secret achievements:

Top Level Cadet (10 points): Got selected as a top-performing cadet.
Outstanding Attack 1 (10 points): Completed Chapter 1 of Attack Mode.
Outstanding Attack 2 (10 points): Completed Chapter 2 of Attack Mode.
Outstanding Attack 3 (10 points): Completed Chapter 3 of Attack Mode.
Outstanding Attack 4 (30 points): Completed the Final Chapter of Attack Mode.
Special Subjugation Medal 1 (10 points): Subjugated your first Dire Subjugation Target.
Special Subjugation Medal 2 (50 points): Subjugated all Dire Subjugation Targets in all Attack Mode episodes.
Titan with Intelligence (10 points): Subjugated a Titan with Titan Eren.