Here is the full list of all 49 Deus Ex: Human Revolution achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
You watched the entire credit list and saw the surprise at the end.
Complete Deus Ex: Human Revolution.
You defeated Zhao Yun Ru and by doing so, destroyed the Hyron Project.
You pointed out the flaws in his logic to millionaire Hugh Darrow.
You found and read the secret message. Now you know too much...
You defeated Jaron Namir, Leader of Belltower's Elite Special Operations Unit.
Descend into the bowels of an urban jungle and confront a warrior-priest.
Perform 50 takedowns within the same playthrough. (Civilians don't count.)
Protect a client's interests by performing a less-than-hostile takeover.
You talked Doctor Isaias Sandoval out of suicide.
Help Officer Nicholas take out the trash.
You convinced the smooth-talking politician Bill Taggart to tell the truth in public.
Follow Pritchard's lead to uncover the truth.
You granted a dying man his final request.
You defeated Yelena Federova, elite member of a secret mercenary hit squad.
Knock out at least 100 enemies in a single playthrough.
Successfully hack at least 50 devices within the same playthrough.
It may take some sleuthing, but justice must be served.
You really nailed your case against Lee Hong.
You convinced a fast-talking bartender to let you see Tong Si Hung.
Help a lady in the oldest of professions clean house.
Fully upgrade your first augmentation of choice.
You had an argument with your boss, David Sarif, and won.
You defeated Lawrence Barrett, elite member of a secret mercenary hit squad.
Put a grieving mother's doubts to rest.
You convinced Wayne Haas to let you into the morgue.
Deal with Mr. Carella's indiscretion.
Upgrade your first weapon of choice.
You convinced Zeke Sanders to let his hostage go.
Perform your first Takedown. Civilians don't count, so be nice.
Perform your first Hack successfully.
You made it through an entire hostile area without making so much as a squeak.
Complete Deus Ex: Human Revolution at its hardest setting.
Experience all the different endings that Deus Ex: Human Revolution has to offer.
Complete Deus Ex: Human Revolution without anyone dying by your hand. (Boss fights do not count.)
Complete Deus Ex: Human Revolution without setting off any alarms.
Read all 29 unique XP books within a single playthrough.
Deal with the man in the shadows.
Help the Hive Bartender settle a tab.
Fully upgrade one of your weapons.
You found all the hidden story items in Megan's Office. Point-and-Click much?
Against all odds, you saved Faridah Malik's life.
You kept Megan's bracelet for yourself. Apparently, letting go really is the hardest part.
Greedy bastard. You accepted O'Malley's blood money and let him go.
You paid poor Jaya's debt in full. How very... humane... of you.
Maybe next time, Jacob will use a more complex code when arming a bomb.
You sent Diamond Chan on the trip of a lifetime.
You convinced Mengyao to spill the beans on the mysterious Hyron Project.
Seems you like playing with balls, eh?