Here is the full list of all 51 Protocol achievements.
Got ending 5.
Destroyed the complex.
Got ending 6.
Found all dead ends in the Technical area.
Guessed the correct password from the Residential unit's door.
Used the terminal's "chat".
Complied with Wilson's request.
Used a hint 10 times.
Ignored contactees' warning.
Used a hint for the first time.
Violated the Protocol for the first time.
Threw a snowball.
Used a hint 50 times.
Used a hint 100 times.
Found all the possible ways to violate the Protocol.
No violations during the game.
Death from the fire.
Death from suffocation.
Forgot to take a keycard in the capsule.
Rolled down a hill.
Threw any object except a snowball.
Forgot a keycard in the lighting terminal.
Entered the iconic password in the first terminal.
Use all the drugs in the complex.
Throw any object back at the alien.
Threw soap at the alien when you first met it.
Vaccinated the alien.
Interrogated the alien using a teapot.
Find a way to go into the far future.
Passed hacker's first mini-game.
Died during the training.
Found a screamer in chapter "Penetration".
Found all the hidden Easter eggs during the "system configuration".
Defeated the first "boss" without damage.
Defeated the second "boss" without damage.
Defeated the third "boss" without damage.
Passed chapter "Penetration" without damage.
Defeated a drone projecting AI many times.
"Called" a combat drone.
Took a shortcut in the chapter "You have violated the Protocol".
Administrated the "dubious" drug again.
Started the fire.
Learned RAT-DG terminal's functionality.
Got ending 0.
Got ending 1.
Got ending 2.
Got ending 3.
Got ending 4.
Got ending 7.
Fetched the hand in ending 3.
Saw the scene after the credits.