Here is the full list of all 36 The Flame in the Flood achievements.
Survive 200 miles in Endless Mode
Survive the first 40 days in Endless Mode without eating any plants
Survive 100 miles in Endless Mode
Survive the first 20 days in Endless Mode without killing any animals
Survive 40 days in Endless Mode without sleeping in a shelter
Die in every possible way
Contract Every Affliction
Travel 10 miles on the river without stopping
Die from dehydration with suffering from dysentery
Eat all the bad stuff in a single playthrough (tainted bait, spoiled fish, raw meat, spoiled meat, devil's trumpet)
Complete the campaign without killing any animals
Craft every item
Equip a full set of Bear Hide clothing
Kill every animal type with arrows
Sleep in 20 churches
Travel 20 miles with the raft motor running
Equip a full set of Wolf Hide clothing
Speak with every river resident
Poison 20 wolves with tainted meat
Repair 1000 points of raft health
Make 50 articles of clothing
Reach The Kingdom in Campaign Mode
Killl a Bear
Have 10 stacked afflictions
Reach Angel Yards in Campaign Mode
Eat every type of plant
Lure a hostile animal into a snake
Visit every location type
Start a new game with items in Aesop's bag
Fully upgrade your raft in a single playthrough
Cure 30 afflictions in a single playthrough
Reach High Ground in the Campaign Mode
After 20 days of travel, have every stat at 100% and no afflictions
Expand your inventory to the maximum
Kill a wolf
Build a campfire