Here is the full list of all 18 Time To Stop Time achievements.
Meet with the seer.
Defeated The Four Horsemen and saved the world.
Saved the presiden'ts daughter and declassified the FBI document.
Obtained secret Nazi documents.
Discovered Atlas progress in Ancient Egypt.
Passed through Egypt on pursuit of the weapon.
Entered the dark forest.
Followed the Nazis to Argentina.
Obtained the keycard to La Scienza facility.
Defeated the speedster robots.
Sent back to the wrong year.
Entered Hiter's bunker in 1945.
Defeated the Nazis monster in Normandy, France.
Saved president JFK and obtained the CIA document about WW-II prisoners.
Equipped the sword... Texas.
Time Travelled for the first time.
Released the Virus.
Obtained the Weapon.