Here is the full list of all 49 Bernackels' Shoggoth achievements.
Reach Level 20.
Reach Level 40.
Reach Level 60.
Reach Level 80.
Reach Level 100.
Collect a key.
Collect 10 keys.
Escape 20 times.
Execute a Seeker.
Execute 20 Seekers.
Execute 100 Seekers.
Collect 1 gold.
Collect 10 gold.
Collect 50 gold.
Possess 10 gold.
Collect a golden coin.
Use 50 skills.
Use 500 skills.
Collect a brown hat.
Collect a red hat.
Collect a black hat.
Collect a white hat.
Collect a pink hat.
Unlock his secret.
Use a legendary skill.
Find all tutorial tips.
Collect 50 keys.
Escape the level.
Escape 10 times.
Fly with maximum speed.
Survive a hunter's fire by a narrow margin.
Explore the depth.
Press all alarm buttons.
Finish a session as Host.
Win a round without crashing.
Buy all items in the shop.
Finnish a 4vs2 game.
Finnish a 2vs1 game.
Escape the level as the last Seeker in play.
Execute 4 Seekers in a single session.
Win a round where every Seeker escapes the level.
Collect a key within the first 60 seconds.
Travel 5,000m in a single session.
Travel 100,000m.
Crash 50 times in a single session.
Resurrect a teammate.
Collect 100 grey books in a single session.
Resurrect 20 teammates.
Resurrect 100 teammates.