Here is the full list of all 47 Doctor Who: The Eternity Clock achievements.
Kiss 6 Stormcage guards
Use the gold bullion crate to smash your way out of the Bank of England
Scan 10 objects
Press 10 TARDIS console buttons
Collect 5 hats
Collect 5 diary pages
Collect 10 hats
Collect 10 diary pages
Collect 20 hats
Collect 20 diary pages
Escape the Stormcage without being detected
Escape Stormcage in under 8 minutes
Beat the Cybermen to the Underground refugee camp
Defeat the Cybermen in the Underground refugee camp
Stun 5 Cybermen
Re-route the gas pipe plans in Victorian London
Open the security door in the office block
Re-route the thermionic consoles in the Cyberfactory
Finish the Cyberfactory in under 20 minutes
Lower the drawbridge in Old London Bridge
Collect the Stasis Field Generator in the Silence Base
Finish "Return to Victorian London" in under 15 minutes
Sonic disarm 5 Silurians
Wake up River in the tomb
Outwit the Silence without being checkpointed
Defeat Vekkis
Outwit the Strategist Dalek
Quick-shoot 5 Daleks
Power-shoot 5 Daleks
Discover the statue in the Elizabethan Quadrangle
Activate the crane winch in Old St. Pauls
Defeat the Silence and steal their time capsule
Find the TARDIS inside the Dalek time lock
Send the Dalek Supreme to the Arctic
Finish time-locked London in under 20 minutes
Shoot the Emperor Dalek in the eyestalk
Defeat the Emperor of the Daleks
Complete a Data Link puzzle in under 60 seconds
Complete a Re-Router puzzle in under 60 seconds
Complete a Mind Map puzzle on Medium or Hard in under 60 seconds
Complete a Time Corridor in under 2 minutes
Complete the game
Complete the game in under 300 minutes
Complete the game on Medium difficulty
Complete the game on Hard difficulty
Collect all of the diary pages
Collect all of the hats