Braid

Steam achievements:
Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.

Closure: Complete the game.

Solved World 2: Fit together all the world 2 puzzle pieces and align the puzzle in its frame.

Solved World 3: Fit together all the world 3 puzzle pieces and align the puzzle in its frame.

Solved World 4: Fit together all the world 4 puzzle pieces and align the puzzle in its frame.

Solved World 5: Fit together all the world 5 puzzle pieces and align the puzzle in its frame.

Solved World 6: Fit together all the world 6 puzzle pieces and align the puzzle in its frame.

Speed Run: Complete a full speed run, beating the challenge time.

Traversed World 2: Travel all the way across World 2.

Traversed World 3: Travel all the way across World 3.

Traversed World 4: Travel all the way across World 4.

Traversed World 5: Travel all the way across World 5.

Traversed World 6: Travel all the way across World 6.

Epilogue:
Find all 60 puzzle pieces and complete the jigsaw puzzles on every World. The broken ladder that leads to the attic in the house where levels are selected will now be fixed. Climb up and enter the door to access World 1. Complete World 1 again to see the Epilogue. You can now revisit the Epilogue by walking into the hidden alcove on the left side of the title screen.

Alternate ending sequence:
Collect the first seven secret stars to unlock the last secret star in the final level. Some of the switches in that level can no longer be affected by time manipulation, allowing the last secret star to be collected and changing the ending.

Hint: Epilogue: New journal text:
Every room in the Epilogue except for the last one has one or more objects that you can stand behind. Open the red journal on that screen and display its text. Stand behind one of the previously described objects. If done correctly, you will hear a sound and new text will appear. Note: If you open a green book, the red book will close and the text will disappear. Time manipulation must then be used to see all four new text.

First room: Read the red book then find the hidden book with the scream.

Second room: Drop down, read the red book, then use time manipulation to rewind up to the left hand ledge. Walk behind the scenery until you hear the sound again.

Third room: Read the red book and walk into the next room. Stand on the left side of the green platform. Use time manipulation to rewind until you hear the green book close. Walk back into the third room. Move behind the rock.

Fourth room: Hit the switch so that the green platform goes up. Hit the switch to bring it back down. Stand on the red book. Use time manipulation to rewind so that the platform moves up with you on it. Run off the left of the platform. Look behind the rock for the sound.