Tomb Raider Lost Artifact Remastered - Willard's Lair Achievement Based Playthrough (All pickups)

This playthrough will cover all 21 Lost Artifact related achievements, kindly note that this playthrough doesn't include 100% enemy kills as it is not required. Also, all item pickups are included in this playthrough although it's not required for the achievement.
Level 2 : Willard's Lair Related Achievements
1. Bloodhound (2 of 6) - Find hidden harpoons 0:47
2. Codex of Scotland (2 of 2) - Find all 3 secrets (Location : 4:03 , 15:48 & 19:41)
3. Underground Pool - Make all boulders roll in the dungeon 2:05
4. Abandon Hope - Enter Willard's hideout through the spiked ceilings 4:48 - 6:36
5. Do Not Abandon Hope - Enter Willard's hideout through the back door 6:46 - 8:30 / 12:27
6. Veni, Vidi, Tulit - Don't miss that medipack behind bars 6:58
7. Callanish Way Out - Get to the helicopter through the secret passageway 19:36 - 21:39
At the end of this video, you should get 6 new achievements from completing this level.

[@PuppyPiers]

Interesting I dealt with the spiked walls differently, I did the u-turn like you but on the 3rd floor, meaning i couldn't access the door to the medipack behind the fence. So essentially i redid it by just going to the door then coming down before reaching the lair and doing the spiked ceilings in reverse to return to the secret, which i guess it's the way you're meant to do it, but your way is certainly quicker with less backtracking, you didn't even need to press the switch to lower one of the spikes. Thank you once again for a great and clear guide.