A Plague Tale: Innocence
35 Achievements
12-15h
Captain Sidekick
Stay with the captain
3.7%
How to unlock the Captain Sidekick achievement in A Plague Tale: Innocence - Definitive Guide
In Chapter 14 (XIV - Blood Ties), you play as Hugo and about halfway through the chapter you have to follow Lord Nicholas to Beatrice's cell. If you fall behind and Lord Nicholas closes the door, you'll have to start all over again. Achievement/trophy pops if successful and once you hide under the table.
After a small conversation, you will get to a courtyard. Here you have to beat Lord Nicholas to a certain room.
What I did was, I kept hugging the left side of the bushes in front of you first.
Cross the small opening (they will notice you, but it won't be enough for you to get caught).
After that take the diagonal turn, evading the guard in front of you.
Cross the small opening between the bushes over here as well.
Now go left under the arch. Here you can start running. Take a left turn, followed by a right turn (right after the torch on the wall), keep going straight through the door. Hide under the table to the right and the achievement should pop!
As noted in the comments, another useful solution from Sm4k when also pursuing the Botanist achievement:
In Chapter 14 (XIV - Blood Ties), you play as Hugo and about halfway through the chapter you have to follow Lord Nicholas to Beatrice's cell. If you fall behind and Lord Nicholas closes the door, you'll have to start all over again. Achievement/trophy pops if successful and once you hide under the table.
During Chapter 14, Hugo will be the playable character. He will reach a point where he overhears a conversation and decides to follow a high-ranking captain in order to reach the prison and meet someone very important to him. The goal is to tail this captain all the while without being seen. While the first half is straightforward, the second half, which takes place in a courtyard, is trickier because Hugo will have to sneak ahead of the captain when the latter is in a conversation with a fellow soldier. Once Hugo enters the courtyard, turn left and use the bushes as cover to reach the exit on the opposite side. The exit leads to a corridor which offers two paths, to the front into the next room, and to a flight of stairs to the left. Head front into the next room, and hide under the cart. The achievement should unlock soon, long before the captain arrives. Reaching this corridor ahead of the captain is essential because, if not, the captain would close the door behind him, making Hugo no longer able to keep up with him.
Consult the following video if you have any trouble. All credit goes to its maker, Trophygamers.
You need to cross the entire garden, get into the open door opposite the original start of the entrance.
As soon as we get to the other side, we need to go forward and hide under the table, a ding will immediately happen