Here is the full list of all 50 Risen achievements.
"Secure the volcano keep" completed
"The Titan trap" completed
"The fourth seal of rune magic" completed
"Find all the vassal rings" completed
"Find all the teleport stones" completed
"The Inquisitor is dead!" completed
"Defeat the Titan!" completed
2000 monsters killed
250 quests completed
100% achieved in an attribute
Every close combat talent learned
Every ranged combat talent learned
100% achieved in three attributes
300,000 gold coins obtained
100 weapons forged
100,000 gold coins obtained
"The mystery of the eastern temple" completed
"A package for the Don" completed
Find Helmar's murderer completed
"The legend of the Gyrger" completed
"Where is Patty?" completed
"Esteban's return to Harbour Town" completed
20 chickens killed
Rescued the orge, Drok
All crystals learned
Caught by the tideworm 10 times
Fell to death 3 times
25 Jest spells used
100 locks picked
50 pockets picked
20 tool bags collected in inventory
500 monsters killed
"The sons of Tilda" completed
10 treasures found
Seven grave moths killed
"Power struggle" completed
20 wild boars killed
Every Crafting profession learned
"The test of Master Ignatius" completed
"Pease and order" completed
"Woman beater" completed
"Medicine for everyone" completed
The farmer's sick wife completed
1000 gold coins obtained
Found first bow
10 grain plants collected
"Rescue Sara from the wilderbess" completed
Found first map in the game
Found way out of the first ruin
First monster killed