Neverwinter

Lans is our misunderstood antagonist, you'll see what I mean. You will have multiple encounters with Lans across the campaign. Learning about him will range from dropped lore, speaking with him and others, and fighting him. If you miss a lore entry, you won't be able to do the subsequent entries. The entire Lans Thuliaga questline must be done in chronological order.

Chapter 1: Lore - Warrior: 3483, 435 (red banner behind the fire after the boss fight)
Chapter 2: Lore - Lords' Alliance: Once you save Lucas Shaneway III at the end of the chapter; speak with him and select the 2nd speech option that reads: "Do you know about a warrior named Lans Thuliaga?"
Chapter 3: Lore - Hero: You will speak with Lans as part of the questline. Once you do, choose the 2nd speech option which reads "Is this is a trick? You just fought me in the Underdark". Lans protests your claim and you should again choose the 2nd speech option; "Linu, can you tell if Lans is telling the truth?". The next screen you'll get the speech option "Before we go Lans, why did you travel to the Underdark with the Order of the Gauntlet?" Lans will give new dialogue here, then select "No, I wasn't. Very well, you're with us, Lans. Let's go deeper." The mission will continue from here.
After Ch. 3: Lore - Survivor: Talk to Sergeant Knox in Protector's Enclave or Dread Ring. There should be a "Do you know about a man named Lans Thuliaga?" speech option. Knox will elaborate that Lans was captured by Drow. Knox will mention he was with Makos.
Chapter 4: Lore - Unlucky: Talk to Makos in the Dread Ring or at the start of Chapter 4 in Mantol-Derith, if you still need to complete the campaign mission. There should be a "Do you know anything about a man named Lans Thuliaga?" speech option. Makos will elaborate about Lans capture and escape; and will mention Mind Flayers which leads you to the Whispering Caverns.
After Ch. 4: Lore - Slave: Examine the Rusted Greatsword on the high bridge in the Crucible area of the Whispering Caverns at coordinates: 1799, 1013. If you find yourself near the coordinates with a stone pillar in your way...look up!
Chapter 9: Lore - Baphomet's Pawn: Shortly after you dispatch 7 groups of demons, you'll encounter our friend (or foe) Lans at coordinates 437, 154. During the cutscene, Lans will escape by jumping off a ledge. Return to this ledge and examine the Dropped Dagger at coordinates: 417, 223.
Chapter 11: After you defeat Lans again you'll have the option to speak with him. Do so and your final conversation should look like this. If you've missed something you will only see the speech option that reads "Take your time and rest, Lans. You'll be better one day."
If you've gotten all the lore entries to this point then you should see an orange text speech option that reads, "The Lans I know wasn't a monster. All he wanted to do was save a group of slaves in the Underdark. You were being used by Baphomet...it wasn't your fault."
Lans will protest your claim and you'll see the next speech option that reads, "I've gone to great lengths to find out everything I could about you, Lans. You weren't a bad person...and you can still come back."
Lans will begin to remember the life he previously had and he'll thank you for your deeds. You final speech option will read, "That's good, Lans. Take your time and recover."

Once you exit the conversation the achievement and title will unlock.